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

int cmmdc(int a, int b)
{
	while (a != b)
	{
		if (a > b)
			a = a - b;
		else
			b = b - a;
	}
	return a;
}
int fractii(int number)
{
	int cou = 0;
	for (int i = 1; i <= number; i++)
	{
		for (int j = 1; j <= number; j++)
		{
			if ((cmmdc(i, j) == 1))
			{
				cou++;
			}
		}
	}
	return cou;
}

int main()
{
	ifstream in("fractii.in");
		int nr, cou;
	in >> nr;
	cou = fractii(nr);
	ofstream out("fractii.out");
	out << cou;

}