#include<iostream>
using namespace std;
int GCD(int a,int b){
    if(b==0){
        return a;
        
        return GCD(b,a%b);
    }
    
    int main(){
        int a=25,b=50;
        cout<<"GCD of"<<a<<"and"<<b<<"is"<<GCD(a,b)<<endl;
        
    }
}