#include <bits/stdc++.h>

using namespace std;

double nums[105] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1.7,1.7,1.7,2,2,2.3,2.3,2.3,2.7,2.7,2.7,2.7,2.7,3,3,3,3,3,3.3,3.3,3.3,3.3,3.3,3.7,3.7,3.7,3.7,3.7,4,4,4,4,4,4.3,4.3,4.3,4.3,4.3,4.3};

int main()
{
    int t, x;
    cin >> t;
    while(t--)
    {
        cin >> x;
        if(x<60)
        {
            printf("0.0\n");
            continue;
        }
        int i,j,k,l;
        double maxx = -1;
        for(i=60; i<=x; i++)
        {
            for(j=0; j<=x-i; j++)
            {
                for(k=0; k<=x-i-j; k++)
                {
                    l=x-i-j-k;
                    if(l<0)
                        maxx = max(maxx,nums[i] + nums[j] + nums[k]);
                    else
                        maxx = max(maxx,nums[i] + nums[j] + nums[k] + nums[l]);
                }
            }
        }
        printf("%.1lf\n",maxx);
    }
    return 0;
}