#include <iostream>
#include <fstream>

using namespace std;

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

int main()
{
    int n, i,k=0;
    in >> n;
    for (i=1; i<=n; i++) //mai incolo i=2;
    {
        for (int j=1; j<=n; j++)
            if (i%j!=0 && j%i!=0)
                k++;
    }
    out<< k+n+n-1;

    return 0;
}