#include <algorithm> #include <iostream> using std::cin; using std::cout; using std::endl; int t, a, p; int main() { cin >> t; while (t--) { cin >> a >> p; if (p < 16) { cout << std::max(0, a - 10) << endl; } else if (p > 20) { cout << std::max(0, a - p + 20) << endl; } else { cout << a << endl; } } return 0; }