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

 1 /*
 2 Written By. StelaYuri
 3 On 2020/01/19
 4 */
 5 #include<bits/stdc++.h>
 6 using namespace std;
 7 typedef long long ll;
 8 int a[1005],b[1005];
 9 void solve(){
10     int n,i;
11     cin>>n;
12     double ans=0;
13     for(i=1;i<=n;i++)
14         ans+=1.0/i;
15     printf("%.12f\n",ans);
16 }
17 int main(){
18     solve();
19     
20     return 0;
21 }