#include <fstream>
#include <iostream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
bool prime (int a, int b)
{   int r;
    while (b != 0)
    {
        r = a % b;
        a = b;
        b = r;
    }
    if (a == 1)
        return true;
    else
        return false;
}


int main()
{
    int s, n;
    f >> n;
    s = n + n - 1;
    for (int i = 2 ; i <= n; i++)
    {
        for (int j = 2; j <= n; j++){
            if (prime(i, j) == true)
                {
                    s ++;
            }
        }
    }
    g << s ;

}