#include <bits/stdc++.h>
using namespace std;
int A[11]={95,90,85,80,75,70,67,65,62,60,0};
double B[11]={4.3,4,3.7,3.3,3.0,2.7,2.3,2,1.7,1,0};
double F[401];
int main()
{
    for (int i=0;i<=10;++i)
        for (int j=0;j<=10;++j)
            for (int k=0;k<=10;++k)
                for (int l=0;l<=10;++l)
                    if (A[i]+A[j]+A[k]+A[l]<=400)
                    {
                        F[A[i]+A[j]+A[k]+A[l]]=max(F[A[i]+A[j]+A[k]+A[l]],B[i]+B[j]+B[k]+B[l]);
                    }
    for (int i=1;i<=400;++i) F[i]=max(F[i],F[i-1]);
    int TT;
    cin>>TT;
    for (int i=1;i<=TT;++i)
    {
        int n;
        cin>>n;
        printf("%.1lf\n",F[n]);
    }
    return 0;
}