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

void solve()
{
    long long a,b;
    cin>>a>>b;
    long long total=a*b;
    long long mn=min(a,b);
    long long result=total-mn;
    cout<<result<<endl;
}

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