func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     while (t--) {       long long a, b, x, y, n;       cin >> a >> b >> x >> y >> n;       long long a1 = a, b1 = b, n1 = n;       long long an = a - x, bn = b - y;       b -= min(bn, n);       n -= min(bn, n);       a -= min(an, n);       a1 -= min(an, n1);       n1 -= min(an, n1);       b1 -= min(bn, n1);       cout << min(a1 * b1, a * b) <<   n ;     }   }   