#include <bits/stdc++.h>
using namespace std;
void solve() {
  long long int h, m;
  cin >> h >> m;
  long long int t = h * 60 + m;
  long long int a = 1440 - t;
  cout << a << endl;
}
int32_t main() {
  ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
  long long int t = 1;
  cin >> t;
  while (t--) solve();
  return 0;
}
