#include <iostream>
#include <vector>
#include <map>
#include <string>
#include <cmath>
using namespace std;

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

	while (a != b){
	    if (a > b){
	        a = a - b;}
	    else{
	        b = b - a;}
	}cout<< a;

	return 0;
}