code/homework_11.22(2).cpp

#include<iostream>
#include<iomanip>

using namespace std;

int main(){
    int n;

    cin >> n;

    double sum = 0.0;

    for (int i = 1; i <= n; ++i)
    {
        sum += 1.0 / i;
    }

    cout <<fixed<<setprecision(3)<<sum<<endl;

    return 0;
}