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



int gcd(int a, int b) {
    // TODO: implement this recursively
    return 0;
}


int main(void) {
    int a, b;
    if (scanf("%d %d", &a, &b) != 2) return 0;
    printf("%d\n", gcd(a, b));
    return 0;
}