/*
 * Student: S.K. Soekhlal
 * Number: 4860632
 * Assignment: 3.4
 */ 

#include<stdlib.h>
#include<stdio.h>

int gcd (int p, int q)
{
	int r,t;
    while (q > 0)
    {
        r = p%q;
        p=q;
        q=r;
    }
    return p;
}



int main(){
    int a,b;
    scanf("%d%d",&a,&b);
    printf("%d\n",gcd(a,b));
    return 0;
}