#include <iostream>
#include <fstream>

using namespace std;

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

int cmmdc(int a, int b)
{
    int r;
    r = a % b;
    while(r!=0)
    {
        a = b;
        b = r;
        r = a % b;
    }
    return b;
}

int main()
{
    int n, i, j, s = 0;
    in >> n;
    for (i = 1; i <= n; i++)
    {
        for (j = 1; j <= n; j++)
        {
            if (cmmdc(i, j) == 1)
                ++s;
        }
    }
    out << s;
    return 0;
}