#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include //#include #pragma warning(disable:4996) typedef long long ll; typedef unsigned long long ull; #define MIN(a, b) ((a)>(b)? (b): (a)) #define MAX(a, b) ((a)<(b)? (b): (a)) #define LINF 9223300000000000000 #define LINF2 1223300000000000000 #define INF 2140000000 const long long MOD = 1000000007; //const long long MOD = 998244353; using namespace std; void solve() { int a, b; scanf("%d%d", &a, &b); if (a == 0 && b == 0) { printf("1\n"); } else if (a == 1 && b == 0) { printf("1\n"); } else if (a == -1 && b == 0) { printf("1\n"); } else if (a == -1) { printf("2\n"); } else { printf("-1\n"); } return; } int main(int argc, char* argv[]) { #if 1 solve(); #else int T; scanf("%d", &T); int t; for(t=0; t