/**
 *  written by Binoy Barman .
**/

#include<bits/stdc++.h>
using namespace std;
#define nl '\n'
#define all(v) v.begin(), v.end()
#define Too_Many_Jobs int tts, tc = 1; cin >> tts; hell: while(tts--)
#define Dark_Lord_Binoy ios_base::sync_with_stdio(false); cin.tie(NULL);

#ifdef LOCAL
#include "unravel.hpp"
#else
#define dbg(...) 42
#endif
#define int long long

int32_t main() {
Dark_Lord_Binoy
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    Too_Many_Jobs {
        int n, k;
        cin >> n >> k;
        if(n >= k) {
            cout << 0 << nl;
            goto hell;
        }
        int L = 1, H = k / 2, mid, ans = INT_MAX;
        while(L <= H) {
            mid = (L + H) >> 1;
            if(mid + mid * n > k) {
                H = mid - 1;
            }
            else {
                ans = mid;
                L = mid + 1;
            }
        }
        int x = ans + (k - (ans + ans * n)), y = ans;
        cout << x * y << nl;
    }

    return 0;
}