#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define all(x) (x).begin(),(x).end() #define rep(i,m,n) for(int i = m;i < n;++i) #define pb push_back #define fore(i,a) for(auto &i:a) #define rrep(i,m,n) for(int i = m;i >= n;--i) #define INF INT_MAX/2 using namespace std; using ll = long long; using R = double; using Data = pair>; const ll MOD = 1e9 + 7; const ll inf = 1LL << 50; struct edge { ll from; ll to; ll cost; }; int main() { int x, y; cin >> x >> y; if (x == y)cout << 0 << endl; else if (x != 0 && y == 0) { cout << 1 << endl; } else if (x == 0 && y != 0) { cout << 2 << endl; } else if (x != 0 && (x == -y)) { cout << 3 << endl; } else { cout << -1 << endl; } return 0; }