/*
	Calculating GCD of two Integer
	Author: md.moniruzzaman
*/

#include<stdio.h>

int gcd(int a, int b) { return b ? gcd(b,a%b) : a; }

void main() {
	int a, b;
	scanf("%d%d",&a,&b);
	printf("%d\n",gcd(a,b));
}