@@ -0,0 +1,12 @@
+#include<bits/stdc++.h>
+
+using namespace std;
+int gcd(int a,int b){
+ return b?gcd(b,a%b):a;
+}
+int main() {
+ int a, b;
+ cin>>a>>b;
+ cout<<gcd(a,b)<<endl;
+ return 0;