#include<bits/stdc++.h>
using namespace std;
#define ll long long int 
int main()
{
  ll tc;
    cin>>tc;
    while(tc--)
    {
        ll n,m;
        cin>>n>>m;
        ll l=0,r=m,ans=0;
        while(l<=r)
        {
            ll mid=(l+(r-l)/2);
            ll u=mid*n;
            if(u>m)
            {
                r=mid-1;
            }
            else
            {
                  ll d=((m-(mid*n))*mid);
                if(d>ans)
                {
                    ans=d;
                    r=mid-1;
                }
                else
                    l=mid+1;
            }
        }
        cout<<ans<<endl;
    }
}