#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <algorithm>

using namespace std;

template<class Type>
inline void R(Type &x) {
    int c = getchar();
    bool neg = 0;
    for (; c < 48 || c > 57; c = getchar())if (c == '-')neg = true;
    for (x = 0; c > 47 && c < 58; x = (Type) 10 * x + c - 48, c = getchar());
    if (neg)x = -x;
}

int T, X;

double c[101], f[401];

int main() {
    for (int i = 0; i <= 100; ++i) {
        if (i <= 59)
            c[i] = 0.0;
        else if (i <= 61)
            c[i] = 1.0;
        else if (i <= 64)
            c[i] = 1.7;
        else if (i <= 66)
            c[i] = 2.0;
        else if (i <= 69)
            c[i] = 2.3;
        else if (i <= 74)
            c[i] = 2.7;
        else if (i <= 79)
            c[i] = 3.0;
        else if (i <= 84)
            c[i] = 3.3;
        else if (i <= 89)
            c[i] = 3.7;
        else if (i <= 94)
            c[i] = 4.0;
        else if (i <= 100)
            c[i] = 4.3;
    }
    R(T);
    while (T--) {
        R(X);
        for (int j = 1; j <= X; ++j)
            f[j] = 0.0;
        for (int i = 0; i <= min(100, X); ++i)
            for (int j = i; j <= X; ++j)
                f[j] = max(f[j], f[j - i] + c[i]);
        printf("%.1lf\n", f[X]);
    }
    return 0;
}