/*
*Copyright (c) Swadheen Islam Robi (SIR01)
*Created on Thu Sep 05 2024 8:30:43 PM
*/
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define pie 2*(acos(0.0))
#define yes cout<<"YES\n"
#define no cout<<"NO\n"
#define pb push_back
#define endl "\n"
#define lcm(a,b) (a*b)/(__gcd<ll>(a,b))
#define mod 1000000007
#define srt(v) sort(v.begin(),v.end())
#define rsrt(v) sort(v.rbegin(),v.rend())
#define ALLAHU_AKBAR ios::sync_with_stdio(false); cin.tie(nullptr);
void sir()
{
ll a,b; cin>>a>>b;
if(a==1 && b==1) cout<<0<<endl;
else
cout<<(a*b)-min(a,b)<<endl;
}
int main() {
ALLAHU_AKBAR
ll t = 1;
cin>>t;
while(t--)
{
sir();
}
return 0;
}