#include <cstdio>
#include <algorithm>
using namespace std;
#define S 400 + 5

int Case, x;
double Score[101], Dp[5][S];

void Prepare()
{
    for (int i = 0; i <= 100; i ++)
    {
        if (i <= 59)
            Score[i] = 0.0;
        else if (i <= 61)
            Score[i] = 1.0;
        else if (i <= 64)
            Score[i] = 1.7;
        else if (i <= 66)
            Score[i] = 2.0;
        else if (i <= 69)
            Score[i] = 2.3;
        else if (i <= 74)
            Score[i] = 2.7;
        else if (i <= 79)
            Score[i] = 3.0;
        else if (i <= 84)
            Score[i] = 3.3;
        else if (i <= 89)
            Score[i] = 3.7;
        else if (i <= 94)
            Score[i] = 4.0;
        else Score[i] = 4.3;
    }
    for (int i = 1; i < S; i ++)
        Dp[0][i] = -1e30;
    for (int c = 1; c <= 4; c ++)
        for (int s = 0; s < S; s ++)
        {
            Dp[c][s] = -1e30;
            for (int i = 0; i <= 100 && i <= s; i ++)
                Dp[c][s] = max(Dp[c][s], Dp[c - 1][s - i] + Score[i]);
        }
}

int main()
{
    Prepare();
    for (scanf("%d", &Case); Case; Case --)
    {
        scanf("%d", &x);
        printf("%.1f\n", Dp[4][x]);
    }
    return 0;
}