#include <cstdio>
#include <cstring>
#include <cmath>
#include <iostream>
#include <algorithm>
#include <vector>
#include <stack>
#include <sstream>
#include <map>
#include <set>
#include <string>
using namespace std;
int a[1000]=   {0,0,60, 62, 65, 67, 70, 75, 80, 85, 90, 95};
double b[1000]={0,0,1.0,1.7,2.0,2.3,2.7,3.0,3.3,3.7,4.0,4.3};
int main()
{
    int t;
    cin >> t;
    for (int I=1;I<=t;I++)
    {
        int sum;
        cin >> sum;
        double ans=0;
        for (int i=1;i<=11;i++)
        {
            for (int j=1;j<=11;j++)
            {
                for (int k=1;k<=11;k++)
                {
                    for (int l=1;l<=11;l++)
                    {
                        if(a[i]+a[j]+a[k]+a[l]<=sum)
                        {
                            if(b[i]+b[j]+b[k]+b[l]>ans) ans=b[i]+b[j]+b[k]+b[l];
//                            ans=max(ans,b[i]+b[j]+b[k]+b[l]);
                        }
                    }
                }
            }
        }
        printf("%.1f\n",ans);
//        cout << ans << endl;
    }
    return 0;
}