#include <bits/stdc++.h>

using namespace std;
ifstream in("fractii.in");
ofstream out("fractii.out");
int main()
{
    int n, p, q, s;
    in >> n;
    s = n + n - 1;
    for(p = 2; p <= n; p++)
    {
      for(q = 2; q <= n; q++)
      {
        if(max(p,q) % min(p,q) != 0)
           s++;
        }
      }
    out << s;
    in.close();
    out.close();
    return 0;
}