diff --git a/wkdghdwns199/README.md b/wkdghdwns199/README.md
index 4ef306e..fd80f07 100644
--- a/wkdghdwns199/README.md
+++ b/wkdghdwns199/README.md
@@ -22,4 +22,5 @@
 | 18차시 | 2024.04.03 | 집합과 맵 |  <a href="https://www.acmicpc.net/problem/26069">절댓값 힙</a>  | <a href="https://github.com/AlgoLeadMe/AlgoLeadMe-6/pull/73">2024.04.03</a> |
 | 19차시 | 2024.04.07 | 조합론 |  <a href="https://www.acmicpc.net/problem/25192">인사성 밝은 곰곰이</a>  | <a href="https://github.com/AlgoLeadMe/AlgoLeadMe-6/pull/76">2024.04.07</a> |
 | 20차시 | 2024.05.02 | 그리디 |  <a href="https://school.programmers.co.kr/learn/courses/30/lessons/42862?itm_content=course14743">체육복</a>  | <a href="">2024.05.02</a> |
+| 21차시 | 2024.05.05 | 그리디 |  <a href="https://school.programmers.co.kr/learn/courses/30/lessons/42860">조이스틱</a>  | <a href="">2024.04.07</a> |
 
diff --git a/wkdghdwns199/tempCodeRunnerFile.java b/wkdghdwns199/tempCodeRunnerFile.java
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/wkdghdwns199/tempCodeRunnerFile.java
@@ -0,0 +1 @@
+
diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Java/.vscode/settings.json" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Java/.vscode/settings.json"
new file mode 100644
index 0000000..0ac215c
--- /dev/null
+++ "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Java/.vscode/settings.json"
@@ -0,0 +1,7 @@
+{
+    "java.project.sourcePaths": ["src"],
+    "java.project.outputPath": "bin",
+    "java.project.referencedLibraries": [
+        "lib/**/*.jar"
+    ]
+}
diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Java/README.md" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Java/README.md"
new file mode 100644
index 0000000..a43b9f6
--- /dev/null
+++ "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Java/README.md"
@@ -0,0 +1,18 @@
+## Getting Started
+
+Welcome to the VS Code Java world. Here is a guideline to help you get started to write Java code in Visual Studio Code.
+
+## Folder Structure
+
+The workspace contains two folders by default, where:
+
+- `src`: the folder to maintain sources
+- `lib`: the folder to maintain dependencies
+
+Meanwhile, the compiled output files will be generated in the `bin` folder by default.
+
+> If you want to customize the folder structure, open `.vscode/settings.json` and update the related settings there.
+
+## Dependency Management
+
+The `JAVA PROJECTS` view allows you to manage your dependencies. More details can be found [here](https://github.com/microsoft/vscode-java-dependency#manage-dependencies).
diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Java/src/App.java" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Java/src/App.java"
new file mode 100644
index 0000000..14c9abd
--- /dev/null
+++ "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Java/src/App.java"
@@ -0,0 +1,5 @@
+public class App {
+    public static void main(String[] args) throws Exception {
+        System.out.println("Hello, World!");
+    }
+}
diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-1074.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-1074.py"
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diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-10844.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-10844.py"
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diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-11657.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-11657.py"
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diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-11659.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-11659.py"
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diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-11725.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-11725.py"
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diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-13975.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-13975.py"
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diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-14938.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-14938.py"
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diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-14940.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-14940.py"
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diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-16234.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-16234.py"
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diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-16235.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-16235.py"
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diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-1629.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-1629.py"
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diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-1753.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-1753.py"
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diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-18111.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-18111.py"
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diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-18258.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-18258.py"
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diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-2170.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-2170.py"
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diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-21736.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-21736.py"
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diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-2293.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-2293.py"
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diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-2630.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-2630.py"
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diff --git "a/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/ACM-3197.py" "b/wkdghdwns199/\353\246\254\353\267\260\355\222\200\354\235\264/Python/ACM-3197.py"
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diff --git "a/wkdghdwns199/\354\241\260\354\235\264\354\212\244\355\213\261.java" "b/wkdghdwns199/\354\241\260\354\235\264\354\212\244\355\213\261.java"
new file mode 100644
index 0000000..d4913e4
--- /dev/null
+++ "b/wkdghdwns199/\354\241\260\354\235\264\354\212\244\355\213\261.java"
@@ -0,0 +1,24 @@
+
+class Solution {
+    public int solution(String name) {
+        int answer=0;
+        
+        int index;
+        int move = name.length() -1;
+        
+        for (int i=0; i<name.length(); i++){
+            answer += Math.min(name.charAt(i) - 'A' , 'Z' - name.charAt(i)  + 1);
+            
+            index = i + 1;
+            while(index < name.length() && name.charAt(index) == 'A'){
+                index++;
+            }
+            
+            move = Math.min(move, i*2+name.length()-index);
+            move = Math.min(move, (name.length()-index)*2+i);
+            
+        }
+        
+        return answer + move;
+    }
+}
\ No newline at end of file