#include<stdio.h>
#include<iostream>
#include<algorithm>
#include<string.h>
#include<vector>
#include<cmath>
#include<string>
#include<map>
#include<queue>
using namespace std;
typedef long long ll;
const int maxn=1e5+7;
double ans[500]={0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,1.0,1.0,1.7,1.7,1.7,2.0,2.0,2.3,2.3,2.3,2.7,2.7,2.7,2.7,2.7,3.0,3.0,3.0,3.0,3.0,3.3,3.3,3.3,3.3,3.3,3.7,3.7,3.7,3.7,3.7,4.0,4.0,4.0,4.0,4.0,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.3,4.4,4.4,4.6,4.7,4.7,5.0,5.0,5.0,5.4,5.4,5.4,5.4,5.4,5.7,5.7,5.7,5.7,5.7,6.0,6.0,6.0,6.0,6.0,6.4,6.4,6.4,6.4,6.4,6.7,6.7,6.7,6.7,6.7,7.0,7.0,7.0,7.0,7.0,7.4,7.4,7.4,7.4,7.4,7.7,7.7,7.7,7.7,7.7,8.0,8.0,8.0,8.0,8.0,8.3,8.3,8.3,8.3,8.3,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.7,8.7,8.7,8.7,8.7,9.1,9.1,9.1,9.1,9.1,9.4,9.4,9.4,9.4,9.4,9.7,9.7,9.7,9.7,9.7,10.1,10.1,10.1,10.1,10.1,10.4,10.4,10.4,10.4,10.4,10.7,10.7,10.7,10.7,10.7,11.1,11.1,11.1,11.1,11.1,11.4,11.4,11.4,11.4,11.4,11.7,11.7,11.7,11.7,11.7,12.0,12.0,12.0,12.0,12.0,12.3,12.3,12.3,12.3,12.3,12.6,12.6,12.6,12.6,12.6,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,13.1,13.1,13.1,13.1,13.1,13.4,13.4,13.4,13.4,13.4,13.8,13.8,13.8,13.8,13.8,14.1,14.1,14.1,14.1,14.1,14.4,14.4,14.4,14.4,14.4,14.8,14.8,14.8,14.8,14.8,15.1,15.1,15.1,15.1,15.1,15.4,15.4,15.4,15.4,15.4,15.7,15.7,15.7,15.7,15.7,16.0,16.0,16.0,16.0,16.0,16.3,16.3,16.3,16.3,16.3,16.6,16.6,16.6,16.6,16.6,16.9,16.9,16.9,16.9,16.9,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2};

int main (){
   int T;
   cin>>T;
   while(T--){
       int n;
       cin>>n;
       printf ("%.1f\n",ans[n]);

   }

}