#include<bits/stdc++.h>
#define N 
using namespace std;
int t,x;
double db[402] = {
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() {
    scanf("%d",&t);
    for(int T=0; T<t; T++) {
        scanf("%d",&x); 
        printf("%.1lf\n",db[x]);
    }
    return 0;
}