diff --git a/E_1688_CountofMatchesinTournament.java b/E_1688_CountofMatchesinTournament.java
new file mode 100644
index 0000000..dcbcdaf
--- /dev/null
+++ b/E_1688_CountofMatchesinTournament.java
@@ -0,0 +1,17 @@
+public class Solution {
+    public int numberOfMatches(int n) {
+        int matches = 0;
+        while(n!=1) {
+            if (n % 2 == 0) { //çiftse
+                n = n / 2;
+                matches += n;
+
+            } else { //tekse
+                n = ((n - 1) / 2);
+                matches += n;
+                n = n + 1;
+            }
+        }
+        return matches;
+    }
+}
\ No newline at end of file