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