1)

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n; cin >> n;
    float s1 = 0;
    for(int i = 1;i<=n;i++) s1+=1.0/i;
    cout << s1 << endl;
    return 0;
}

2)

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n; cin >> n;
    float s2 = 0;
    for(int i = 1;i<=n;i++){
        if(i%2==0) s2+= 1.0/i;
    }
    cout << s2 << endl;
    return 0;
}

3)

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n; cin >> n;
    float s3 = 0;
    for(int i = 1;i<=n;i++){
        if(i%2!=0) s3+= 1.0/i;
    }
    cout << s3 << endl;
    return 0;
}

4)

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n; cin >> n;
    float s4 = 0;
    for(int i = 1;i<=n;i++) s4 += 1.0*i/(i+1);
    cout << s4 << endl;
    return 0;
}

5)

#include <bits/stdc++.h>
using namespace std;
int main(){
    int n; cin >> n;
    float t=0,s5 = 0;
    for(int i = 1;i<=n;i++){
        t+=i;
        s5+= 1.0/t;
    }
    cout << s5 << endl;
    return 0;
}