#include<iostream>

using namespace std;
int gcd(int a,int b)
{
    if(a>b) swap(a,b);
    int r=b%a;
    while(r!=0)
    {
        b=a;
        a=r;
        r=b%a;
    }
    return a;
}
int main()
{
    int a,b;
    cin>>a>>b;
    cout<<gcd(a,b)<<endl;
    return 0;
}