#include <iostream>
#include <fstream>

using namespace std;



int euclid(int a, int b)
{
    int c;
    while (b) {
        c = a % b;
        a = b;
        b = c;
    }
    return a;
}
int main()
{   int n;
    ifstream f("fractii.in.txt");
    ofstream g("fractii.out.txt");
    f>>n;
    int p,q,nr;
    p=1;
    q=1;
    nr=0;
    for (p=1;p<=n;p++)

        for (q=1;q<=n;q++)

            if (euclid(p,q) == 1) {
                        nr++;

            }
    g<<nr;
     f.close();
     g.close();
    return 0;
}