#include<bits/stdc++.h>
using namespace std;
int main() {
    int a, b;
    cin >> a >> b;
    for (int t = a + b; t >= 1; --t) {
        if (a % t == 0 && b % t == 0) {
            cout << t << endl;
            break;
        }
    }
    return 0;
}