按题意直接模拟即可。

AC code：

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

int main() {
    freopen("league.in", "r", stdin);
    freopen("league.out", "w", stdout);
    int T;
    cin >> T;
    while (T--) {
        long long n;
        cin >> n;
        if (n == 1) {
            cout << 0 << endl;
            continue;
        }
        long long matches;
        if (n > 15) {
            matches = n * (n - 1) / 2;
        } else {
            matches = n * (n - 1);
        }
        long long days = (matches - 1) * 4 + 1;
        cout << days << endl;
    }
    return 0;
}