#include <bits/stdc++.h>
using namespace std;
const int sc[11] = {0, 60, 62, 65, 67, 70, 75, 80, 85, 90, 95};
const double jd[11] = {0, 1, 1.7, 2, 2.3, 2.7, 3, 3.3, 3.7, 4, 4.3};
int T, sum;
double ans;
int main() {
    scanf("%d", &T);
    while (T--) {
        ans = 0;
        scanf("%d", &sum);
        for (int i = 0; i < 11; i++)
            for (int j = i; j < 11; j++)
                for (int k = j; k < 11; k++)
                    for (int l = k; l < 11; l++)
                        if (sc[i] + sc[j] + sc[k] + sc[l] <= sum)
                            ans = max(ans, jd[i] + jd[j] + jd[k] + jd[l]);
        printf("%.1lf\n", ans);
    }
    return 0;
}