#include<stdio.h>
#include<stdlib.h>

void run(void){
  int t;
  scanf("%d",&t);
  int num[50];
  int n=6;
  int i;
  for(i=0;i<t;i++){
    scanf("%d",num+i);
    n=(n<num[i]?num[i]:n);
  }
  double *e=(double *)malloc(sizeof(double)*(n+1));

  e[0]=0;
  double p[7];
  p[1]=(double)1/12;
  p[2]=(double)1/6;
  p[3]=(double)1/4;
  p[4]=(double)1/12;
  p[5]=(double)1/4;
  p[6]=(double)1/6;

  for(i=1;i<6;i++){
    e[i]=1.0;
    int j;
    for(j=1;j<=i;j++){
      e[i]+=p[j]*e[i-j];
    }
  }

  for(i=6;i<=n;i++){
    e[i]=1+p[1]*(e[i-1]+e[i-4])+p[2]*(e[i-2]+e[i-6])+p[3]*(e[i-3]+e[i-5]);
  }

  for(i=0;i<t;i++){
    printf("%.5lf\n",e[num[i]]);
  }
  free(e);
  return;
}

int main(void){
  run();
  return 0;
}