TONG2 C++

#include <bits/stdc++.h>
using namespace std;

int n,i;
float s1,s2;
int main()
{
    freopen("tong2.inp","r",stdin);
    freopen("tong2.out","w",stdout);
    cin>>n;
    s1=0;
    for(int i=1;i<=n;i++) 
        s1=s1+float(1)/i;
    cout<<fixed<<setprecision(2);
    cout<<"S1 = "<<s1<<endl;;
    s2=0;
    for(int i=0;i<=n;i++) 
        s2=s2+float(1)/(2*i+1);
    cout<<"S2 = "<<s2;
}