#include <iostream>

using namespace std;

int main() {
	long long P;
	int K, t;
	scanf("%lld %d",&P,&K);
	bool check = true;


	for (int i = 2; i < K; i++) {
		if (P % i == 0) {
			check = false;
			t = i;
			break;
		}
	}
	if (check == false)
		printf("BAD %d",t);
	else
		printf("GOOD");

	return 0;
}