ZOJ-1216

import java.util.Scanner;

public class Main
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);

System.out.println("# Cards  Overhang");

while (sc.hasNextInt())
{
double sum = 0;
int num = sc.nextInt();
for (int i = 0; i < num; i++)
{
sum += 1d / (i + 1);
}
System.out.format("%5d     %4.3f\n", num, sum / 2);
}
}
}