#include<cstdio>
int main(void) {

	long long int A, B, X, Y;
	scanf("%lld %lld", &A, &B);

	X = A + B;
	Y = A * B;

	while (X%Y != 0 && Y % X != 0) {
		if (X > Y) { X = X % Y; }
		else { Y = Y % X; }
	}

	if (X > Y) {
		printf("%lld",Y );
	}
	else { printf("%lld", X); }

	return 0;

}