#include<stdio.h>

 long long int gcd(long long int C, long long int D) {
	 double tmp;
	 double div1;
	 long long int div2, r;
	
	 div1 = C / D;
	 div2 = div1;
	 r = C % D;

	 while (r != 0) {
		 div1 /= r;
		 div2 = div1;
		 r = div2 % r;
		 if (div2 == 0) {
			 return 1;
		 }
	 }

	 return div2;
}

int main(void) {
	long long int A, B;
	long long int a, b, ans;

	scanf("%lld", &A);
	scanf("%lld", &B);
	
	a = gcd(A + B, A);
	b = gcd(A + B, B);

	if (a*b >= A + B) {
		ans = gcd(a*b, A + B);
	}
	else {
		ans = gcd(A + B, a*b);
	}

	printf("%lld\n", ans);
	
	return 0;

}