#include<iostream>
#include<fstream>
using namespace std;
int cmmdc(int a, int b) {
	if (b == 0)
		return a;
	return cmmdc(a, a%b);
}
int main() {
	int n, count = 0;;
	ifstream in;
	in.open("fractii.in");
	in >> n;
	for (int i = 1; i <= n; i++)
		for (int j = 1; j <= n; j++)
			if (cmmdc(i, j) == 1) {
				count++;
			}
	in.close();
	ofstream out;
	out.open("fractii.out");
	out << count;
	out.close();
	system("Pause");
}