#include <iostream>
using namespace std;
int main()
{
	int n;
	double sum=0;
	double i=1.0;
	cout<<"Cards   Overhang"<<endl;
	while( scanf("%d",&n)!=EOF && n>=0 && n<=99999 )
	{
		while(i<=n)
		{
			sum=sum+1/(2.0*i);
			i++;
		}
		printf("%5d      %.3f\n",n,sum);
		i=1.0;
		sum=0;
	}
	return 0;
}