// 	S(n) = 1 + 1/2 + 1/3 + ... 1/(n-1) + + 1/n
//
//	S(n) = S(n-1) + 1/n

import java.util.Scanner;
public class SumFrac
{
	public static double S (int n)
	{
		if (n==1)
			return 1.0;
		else
			return S(n-1)+1.0/n;
	}
	public static void main(String[] args)
	{
		Scanner input = new Scanner(System.in);

		int n = input.nextInt();
		double f = S(n);
		System.out.println("the result is:"+f);

	}
}