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

using u32 = unsigned int;
using i64 = long long;
using u64 = unsigned long long;

float jidian(int x) {
    if (x < 60) {
        return 0;
    }
  if (x <= 61) {
        return 1.0;
    }
    if (x <= 64) {
        return 1.7;
    }
    if (x <= 66) {
        return 2.0;
    }
    if (x <= 69) {
        return 2.3;
    }
    if (x <= 74) {
        return 2.7;
    }
    if (x <= 79) {
        return 3.0;
    }
    if (x <= 84) {
        return 3.3;
    }
    if (x <= 89) {
        return 3.7;
    }
    if (x <= 94) {
        return 4.0;
    }
    return 4.3;
}

int main() {
    // ios::sync_with_stdio(false);
    // cin.tie(0);
    vector<int> pre(101);
    for (int i = 0; i <= 100; ++i) {
        pre[i] = jidian(i) * 10;
    }
    int test;
    cin >> test;
    while (test--) {
        int x;
        cin >> x;
        int ans = 0;
        for (int a = 0; a <= 100 && 4 * a <= x; ++a) {
            for (int b = a; b <= 100 && a + 3 * b <= x; ++b) {
                for (int c = b; c <= 100 && a + b + 2 * c <= x; ++c) {
                    int d = x - a - b - c;
                    if (d <= 100) {
                        ans = max(ans, pre[a] + pre[b] + pre[c] + pre[d]);
                    }
                }
            }
        }
        printf("%.1f\n", ans / 10.0);
    }
}