#include <bits/stdc++.h>

using namespace std;
using i64 = long long;

void solve() {
    i64 a, b; cin >> a >> b;

    cout << a * b - min(a, b) << '\n';
}

signed main()
{
    ios::sync_with_stdio(false); cin.tie(nullptr);
    i64 T; cin >> T;
    while(T--) solve();
    return 0;
}