#include <iostream>
#include <string>
using namespace std;

int gcd(int a, int b) {
    if (b == 0) {
        return a;
    }
    return gcd(b, a % b);
}

int main() {
    int a, b;
    cin >> a >> b;
    cout << gcd(a, b);
	return 0;
}