#include <bits/stdc++.h>
using namespace std;

#define FAST ios_base::sync_with_stdio(false);cin.tie(NULL);
using ll = long long;

int main() {
  FAST;
  
  int tc = 1, ti;
  cin >> tc;

  for (ti = 1; ti <= tc; ++ti) {
    ll x, y, ans;
    cin >> x >> y;
    ans = x*y - min(x, y);
    cout << ans << "\n";
  }

  return 0;
}