#include <cstdio>
#include <string.h>
#include <algorithm>

using namespace std;

double p[6] = {1./12, 2./12,3./12,1./12,3./12,2./12};
double dt[1090003][2];

int main(){
  int T;
  scanf("%d",&T);
  while(T-->0){
    int n;
    scanf("%d",&n);
    memset(dt,0,sizeof(dt[0]) * (n+100));
    dt[0][0] = 0;
    dt[0][1] = 1;
    for(int i = 0; i < n; i++) {
      for(int j = 1; j <= 6; j++) {
        dt[i+j][0] += (dt[i][0] + dt[i][1]) * p[j-1];
        dt[i+j][1] += dt[i][1]*p[j-1];
      }
    }
    double sum = 0;
    double psum = 0;
    for(int i = n; i <= n+5; i++) {
      sum += dt[i][0];
      psum += dt[i][1];
    }
    printf("%.10f\n", sum/psum);
  }
  return 0;
}