#include <stdio.h>
int main(){
int n,m;
scanf("%d %d", &n, &m);
int catc = 0;
for(int i = 2; i < m; i++){
if(n % i == 0) {
catc = i;
break;
}
}
if(catc != 0) printf("BAD %d", catc);
else printf("%s", "GOOD");
return 0;
}
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