diff --git a/1688-20231205-pass/main.cpp b/1688-20231205-pass/main.cpp
new file mode 100644
index 0000000..ac5ee55
--- /dev/null
+++ b/1688-20231205-pass/main.cpp
@@ -0,0 +1,24 @@
+#include<stdcpp.h>
+using namespace std;
+class Solution{
+    public:
+    int numberOfMatches(int n){
+        int sum = 0;
+        while(n!=1){
+            sum+=n/2;
+            if(n%2) n+=1;
+            n/=2;
+        }
+        return sum;
+    }
+};
+
+int main(){
+    Solution sol;
+    int n;
+    n = 7;
+    cout<<sol.numberOfMatches(n)<<endl;
+    n = 14;
+    cout<<sol.numberOfMatches(n)<<endl;
+    return 0;
+}
\ No newline at end of file