c

#include <iostream>

using namespace std;// |

    int main () {

    int a,b;
    cout<<"a=";cin>>a;
    cout<<"b=";cin>>b;
    while (a!=b)
    {
        if (a>b)
            a-=b;
        else
            b-=a;
    }

    cout<<"cmmdc= "<<a;

    return 0;
    }