#include<iostream>

using namespace std;

int gcd(int a, int b)
{
    for(int i = a;i;i --)
        if(a % i == 0 && b % i == 0)
            return i;
}

int main()
{
    int a, b;
    cin >> a >> b;

    if(a > b) swap(a, b);

    cout << gcd(a, b) << endl;

    return 0;
}