int main()
{
  long m,i,p;
  double x,y,z,a[2000];
  scanf("%d",&m);
x=2;
y=1;
a[0]=0;
  for (i=1;i<=20;i++)
  {
    a[i]=a[i-1]+x/y;
    z=x+y;
    y=x;
    x=z;
    //printf("%lf %lf %lf\n",x,y,z);
  }
  for (i=1;i<=m;i++)
  {
    scanf("%d",&p);
    printf("%.3lf\n",a[p]);
  }
}