1409B.cpp

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    int t;
    cin >> t;
    while (t--)
    {
        ll a, b, x, y, n;
        cin >> a >> b >> x >> y >> n;
        ll min;
        ll first, sec;
        ll temp = (a - x) >= n ? n : (a - x);
        first = temp;
        sec = (b - y) >= (n - temp) ? (n - temp) : (b - y);
        min = (a - first) * (b - sec);
        temp = (b - y) >= n ? n : (b - y);
        first = temp;
        sec = (a - x) >= (n - temp) ? (n - temp) : (a - x);
        if ((b - first) * (a - sec) < min)
            min = (b - first) * (a - sec);
        cout << min << '\n';
    }

    return 0;
}