#include<bits/stdc++.h>
#define int long long
using namespace std;
const double x=0.57721566;
int n;
double ans=1;
signed main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);cout.tie(0);
	cin>>n;
	if(n<=1e6)
	{
		for(int i=1;i<=n-1;i++) ans+=1.0/i;
		cout<<fixed<<setprecision(5)<<ans;
	}
	else cout<<fixed<<setprecision(5)<<(log(n)+x+1)<<endl;
	return 0;
}

第一个点错了