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

#define ll long long
#define nl << "\n"
#define fast ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);

int main() {
	int t;
	cin >> t;
	while(t--) {
		ll a, b;
		cin >> a >> b;
		cout << (a * b) - min(a, b) nl;
	}
}