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

int lnko (int a, int b)
{
    int c;
    while (b != 0)
    {
        c = a%b;
        a = b;
        b = c;
    }
    return a;
}

int szamol (int n)
{
    int db = 0;
    for (int i=1; i<=n ;i++)
        for (int j=1; j<=n; j++)
        if (lnko(i,j) == 1) db++;
    return db;
}

int main()
{
    ifstream f("fractii.in");
    ofstream g("fractii.out");
    int n;
    f >> n;
    g << szamol(n);
    return 0;
}