double cal(int n)
{int i,a=1,b=2,temp;
double sum=0;
for(i=0;i<n;i++)
{sum=sum+(double)b/(double)a;
temp=a+b;
a=b;
b=temp;}
return sum;}
int main()
{int m,i,n[1000];
scanf("%d",&m);
for(i=0;i<m;i++)
{scanf("%d",&n[i]);
printf("%.3f\n",cal(n[i]));}}