#include <iostream>
#include<fstream>
using namespace std;
ifstream f("cmmdc.in");
ofstream g("cmmdc.out");
int euclid(int a,int b)
{
    int div;
    if(a>b)
    div=a;
    else
    div=b;
    while(div>1)
    {
        if(a%div==0&&b%div==0)
        return div;
        div--;
    }
    return 0;
}
int main()
{
    int a,b,div;
    f>>a>>b;
    g<<euclid(a,b);
}