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

#define int long long
#define endl '\n'

void solve()
{
    int n,k; cin >> n >> k;
    int ans;
    if (n >= k) ans = 0;
    else {
        int m = k/n/2;
        ans = (k-(m*n))*m;
    }
    cout << ans << endl;
}

int32_t main()
{   
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t = 1; cin >> t;
    while(t--) solve();
    return 0;
}