#include <iostream>
using namespace std;
int GCD(int a,intb){
    if(b==0)
    return b;
    return GCD(b,a % b);
}
int main(){
    int a=48,b=18;
    cout<<"GCD"<<a<<"&"<<b<<"is"<<GCD(a,b)<<endl;
    return 0;
}