diff --git a/pknujsp/README.md b/pknujsp/README.md
index a5585860..39896530 100644
--- a/pknujsp/README.md
+++ b/pknujsp/README.md
@@ -40,4 +40,5 @@
 | 36차시 | 2024.02.21 |    이진탐색     |                       [휴게소 세우기](https://www.acmicpc.net/problem/1477)                       | [#143](https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/143) |
 | 37차시 | 2024.03.04 |      구현       |         [n+1 카드게임](https://school.programmers.co.kr/learn/courses/30/lessons/258707)          | [#149](https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/149) |
 | 38차시 | 2024.03.08 |   BRUTE_FORCE   |         [자물쇠와 열쇠](https://school.programmers.co.kr/learn/courses/30/lessons/60059)          | [#154](https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/154) |
-| 39차시 | 2024.03.19 |       큐        |        [디스크 컨트롤러](https://school.programmers.co.kr/learn/courses/30/lessons/42627)         | [#163](https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/163) |
\ No newline at end of file
+| 39차시 | 2024.03.19 |       큐        |        [디스크 컨트롤러](https://school.programmers.co.kr/learn/courses/30/lessons/42627)         | [#163](https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/163) |
+| 40차시 | 2024.03.22 |     그리디      |                           [센서](https://www.acmicpc.net/problem/2212)                            | [#168](https://github.com/AlgoLeadMe/AlgoLeadMe-1/pull/168) |
\ No newline at end of file
diff --git "a/pknujsp/\352\267\270\353\246\254\353\224\224/40-\354\204\274\354\204\234.py" "b/pknujsp/\352\267\270\353\246\254\353\224\224/40-\354\204\274\354\204\234.py"
new file mode 100644
index 00000000..07494620
--- /dev/null
+++ "b/pknujsp/\352\267\270\353\246\254\353\224\224/40-\354\204\274\354\204\234.py"
@@ -0,0 +1,18 @@
+from sys import *
+
+N = int(stdin.readline())
+K = int(stdin.readline())
+SENSORS = sorted(set(map(int, stdin.readline().split())))
+
+if K >= N:
+    print(0)
+    exit()
+
+distances = [SENSORS[i] - SENSORS[i - 1] for i in range(1, len(SENSORS))]
+distances.sort(reverse=True)
+
+result = 0
+for i in range(K - 1, len(distances)):
+    result += distances[i]
+
+print(result)