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

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

int gcd (int p, int q)
{
	int r;
    while (q > 0)   /* Loops until the remainder is 0 */
    {
        r = p%q; /* Calculate remainder */
        p=q;    /* Storing the value of q in p */
        q=r;    /* Setting q to the value of the remainder to calculate new remainder in the next iteration */
    }
    return p;   /* Returning p after the loop finishes */
}



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