#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 main()
{
	int n, c = 0,i,j;
	ifstream f("fractii.in");
	ofstream g("fractii.out");
	f >> n;
	for (i = 1; i <= n;i++)
	for (j = 1; j <= n; j++)
	if (cmmdc(i, j) == 1)
		c++;
	g << c;

}