#include <iostream>
#include <fstream>

using namespace std;

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

int euclid(int a, int b)
{
	if (b == 0)
		return a;
	else
		euclid(b, a % b);
}

int main()
{
	int n, count = 0;
	in >> n;
	for (int p = 1; p <= n; p++)
	{
		for (int q = 1; q <= n; q++)
		{
			if (euclid(p, q) == 1)
				count++;
		}
	}
	out << count;
    return 0;
}