#include <iostream>
#include <fstream>
using namespace std;
int a,b,m=2,n=0;
int main()
{
    ifstream f("cmmdc.in");
    ofstream g("cmmdc.out");
    f>>a>>b;
    if(a<=b)
    {
        while(m<=b)
        {
            if(a%m==0&&b%m==0)
            {
                n=m;
            }
            m++;
        }

        g<<n;


    }
    else
    {
        while(m<a)
        {
            if(a%m==0&&b%m==0)
            {
                n=m;
            }
            m++;
        }
        g<<n;
    }


}