Codeforces Round #614 (Div. 2) B.JOE is on TV! (高精度)

B. JOE is on TV!

#include<iostream>
#include<cstdio>
using namespace std;
#define N 100005
int n;double f[N];
int main()
{
	scanf("%d",&n);
	int i;
	double ans=0.0;
	for(i=1;i<=n;i++)
	ans+=1.0/(1.0*i);
	printf("%.12lf",ans);
	return 0;
}