#include <fstream>
using namespace std;

bool eReductibila(int a, int b) {
	if (b % a == 0 || b % a == 0)
		return true;
	return false;
}

int main() {
	ifstream fin("fractii.in");
	ofstream fout("fractii.out");
	int n;
	fin >> n;

	int rez = 0;
	for (int i = 1; i <= n; ++i)
		for (int j = 1; j <= n; ++j)
			if (!eReductibila(i, j))
				++rez;

	fout << rez;
	return 0;
}