#include <stdio.h>

int gcd(int a, int b)
{
	int m;

	m = a % b;
	if (m) {
		return gcd(b, m);
	} else {
		return b;
	}
}

int main()
{
	int a, b;

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