diff --git a/Appendix C/solutions/24389.cpp b/Appendix C/solutions/24389.cpp
index 6c991660..1272d3c0 100644
--- a/Appendix C/solutions/24389.cpp	
+++ b/Appendix C/solutions/24389.cpp	
@@ -1,11 +1,13 @@
-// Authored by : BaaaaaaaaaaarkingDog
+// Authored by : uhwan0723
 // Co-authored by : -
-// http://boj.kr/****************
+// http://boj.kr/7b47d16a20b94095b78c693797ad2cab
 #include <bits/stdc++.h>
 using namespace std;
 
 int main(void){
   ios::sync_with_stdio(0);
   cin.tie(0);
-  
-}
\ No newline at end of file
+  int n;
+  cin >> n;
+  cout << popcount((unsigned int)(n ^ (-n)));
+}