//ac #include using namespace std; int main() { int s, p; cin >> s >> p; int ret = 0; if (p - s <= 0) ret = 0; else if (p - s < 300) ret = 1; else if (p - s < 900) ret = 2; else if (p - s < 1800) ret = 3; else ret = 4; cout << ret << endl; return 0; }