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

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

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

  for (ti = 1; ti <= tc; ++ti) {
    ll a, b, ans;
    cin >> a >> b;

    ans = a*b;
    ans -= min(a, b);

    cout << ans << "\n";
  }

  return 0;
}