#include<iostream>
#include<cstring>
#include<algorithm>
#include<cstdio>
#include<cstdlib>
using namespace std;

int T,x;
double f[5][500],g[500];
double GPA[101];
int main()
{
    cin >> T;
    for (int i = 0;i<=59;++i) GPA[i] = 0;
    for (int i = 60;i<=61;++i) GPA[i] = 1.0;
    for (int i = 62;i<=64;++i) GPA[i] = 1.7;
    for (int i = 95;i<=100;++i) GPA[i] = 4.3;
    for (int i = 90;i<=94;++i) GPA[i] = 4.0;
    for (int i = 85;i<=89;++i) GPA[i] = 3.7;
    for (int i = 80;i<=84;++i) GPA[i] = 3.3;
    for (int i = 75;i<=79;++i) GPA[i] = 3.0;
    for (int i = 70;i<=74;++i) GPA[i] = 2.7;
    for (int i = 67;i<=69;++i) GPA[i] = 2.3;
    for (int i = 65;i<=66;++i) GPA[i] = 2.0;
    memset(f,0,sizeof(f)); 
    for (int i = 0;i<=100;++i)
      for (int j = i;j<=100;++j)
        for (int k = j;k<=100;++k)
          for (int l =k;l<=100;++l)
              g[i+j+k+l] = max(g[i+j+k+l],GPA[i]+GPA[j]+GPA[k]+GPA[l]);
    for (int i = 1;i<=T;++i)
    {
        cin >> x;
        printf("%.1lf\n",g[x]); 
    }
    return 0;    
}