#include <bits/stdc++.h>

using namespace std;

ifstream in("fractii.in");
ofstream out("fractii.out");

int main()
{
    int n, ct, i, j;
    in >> n;
    ct = n;
    for(i=2; i<=n; i++)
    {
        ct++;
        for(j=2; j<=n; j++)
        {
            int ci = i, cj = j;
            while(cj)
            {
                int r = ci%cj;
                ci = cj;
                cj = r;
            }
            if(ci == 1)
                ct++;
        }
    }
    out << ct;

}