#include<bits/stdc++.h>
using namespace std;
#define int long long
#define sc(x) scanf("%lld",&x);
int x,y;
double mp[105];
int a[4];
double ans;
void dfs(int k,int x)
{
    if(k==4){
        ans = max(ans,mp[a[0]]+mp[a[1]]+mp[a[2]]+mp[a[3]]);
        return ;
    }
    for(int i=0;i<=100&&i <= x;i++){
        a[k] = i;
        dfs(k+1,x-i);
    }
}
double Q[405];
double Y[]={4.4,4.4,4.6,4.7,4.7,5,5,5,5.4,5.4,5.4,5.4,5.4,5.7,5.7,5.7,5.7,5.7,6,6,6,6,6,6.4,6.4,6.4,6.4,6.4,6.7,6.7,6.7,6.7,6.7,7,7,7,7,7,7.4,7.4,7.4,7.4,7.4,7.7,7.7,7.7,7.7,7.7,8,8,8,8,8,8.3,8.3,8.3,8.3,8.3,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.6,8.7,8.7,8.7,8.7,8.7,9.1,9.1,9.1,9.1,9.1,9.4,9.4,9.4,9.4,9.4,9.7,9.7,9.7,9.7,9.7,10.1,10.1,10.1,10.1,10.1,10.4,10.4,10.4,10.4,10.4,10.7,10.7,10.7,10.7,10.7,11.1,11.1,11.1,11.1,11.1,11.4,11.4,11.4,11.4,11.4,11.7,11.7,11.7,11.7,11.7,12,12,12,12,12,12.3,12.3,12.3,12.3,12.3,12.6,12.6,12.6,12.6,12.6,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,12.9,13.1,13.1,13.1,13.1,13.1,13.4,13.4,13.4,13.4,13.4,13.8,13.8,13.8,13.8,13.8,14.1,14.1,14.1,14.1,14.1,14.4,14.4,14.4,14.4,14.4,14.8,14.8,14.8,14.8,14.8,15.1,15.1,15.1,15.1,15.1,15.4,15.4,15.4,15.4,15.4,15.7,15.7,15.7,15.7,15.7,16,16,16,16,16,16.3,16.3,16.3,16.3,16.3,16.6,16.6,16.6,16.6,16.6,16.9,16.9,16.9,16.9,16.9,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,
17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2,17.2};
signed main()
{
 int t;
 sc(t)
 for(int i=0;i<=59;i++)mp[i]=0;
 for(int i=60;i<=61;i++)mp[i]=1.0;
 for(int i=62;i<=64;i++)mp[i]=1.7;
 for(int i=65;i<=66;i++)mp[i]=2.0;
 for(int i=67;i<=69;i++)mp[i]=2.3;
 for(int i=70;i<=74;i++)mp[i]=2.7;
 for(int i=75;i<=79;i++)mp[i]=3.0;
 for(int i=80;i<=84;i++)mp[i]=3.3;
 for(int i=85;i<=89;i++)mp[i]=3.7;
 for(int i=90;i<=94;i++)mp[i]=4.0;
 for(int i=95;i<=100;i++)mp[i]=4.3;

 for(int i=0;i<=100;i++){
    ans = 0;
  Q[i] = mp[i];
 }
 for(int i=100;i<=131;i++)Q[i] = 4.3;
 for(int i=132;i<=400;i++){
        Q[i] = Y[i-132];

 }


 while(t--){
    sc(x)
    printf("%.1f\n",Q[x]);
 }
}