#include <bits/stdc++.h>
#include<iostream>
#include<map>
#include<vector>
#include <algorithm>
#include<math.h>
#include <iomanip>
#include<set>
#include <numeric>
#include<string>
using namespace std;

int main()
{
    long long n;
    cin >> n;
    cout << ((n <= 3) ? n : (n-3)*5 + 3) << endl;
}