#include <iostream>
using namespace std;

int main()
{
    int t;
    cin >> t;
    while(t--){
        long long a, b;
        cin >> a >> b;

        long long total_pairs = a*b;
        long long same_pairs = min(a,b);

        long long result = total_pairs - same_pairs;
        cout << result << endl;
    }
}