#include <iostream>
#include <fstream>
using namespace std;

int main()
{
    ifstream f ("fractii.in");
    ofstream g ("fractii.out");
    int n, i, j, c;
    f>>n;
    c=n+n-1;
    for (i=2; i<=n; i++)
        for (j=2; j<=n; j++)
        {
            if (i%j!=0 && j%i!=0)
            {
                c++;
            }
        }
    g<<c;
    f.close();
    g.close();
    return 0;
}