#include<iostream>
using namespace std;


/*int main()
{
	int input;
	double sum = 0.0;
	int i;
	//freopen("test.txt","r",stdin);
	cout<<"Cards  Overhang"<<endl;
	while(cin>>input)
	{
		sum = 0.0;
		for(i = 1; i <= input; i++)
		{
			sum = 1.0/(2.0*i) + sum;
		}
		printf("%5d     %1.3f\n", input, sum);
	}
//	fclose(stdin);
	return 0;
}*/