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

void solve() {
    ll a,b;
    cin>>a>>b;
    ll total_pair=a*b;
    ll same=min(a,b);
    cout<<total_pair-same<<endl;
}

int main(){
    int t;
    cin>>t;
    while(t--){
        solve();
    }
return 0;
}