package coyingbi;
import java.util.Scanner;
public class leijia {
public static void main(String[] args) {
Scanner in=new Scanner(System.in);
int n=in.nextInt();
double sum=0.0;
int sign=1;
for(int i=1;i<=n;i++)
{
// sum+=sign*1.0/i;
// sign=-sign;
if(i%2==1)
{
sum+=1.0/i;
}
else {
sum-=1.0/i;
}
}
System.out.println(sum);
System.out.printf("%.2f",sum);
}
}