#include <iostream>
#include <fstream>

using namespace std;

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

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