/*
 * main.cpp
 *
 *  Created on: Feb 16, 2015
 *      Author: levi
 */

#include <fstream>
using namespace std;

int gcd(int a, int b) {
	if ((a==0)||(b==0)) return a+b;
	if (a==b) return a;
	if (a>b) return gcd(a-b,b);
	else return gcd(a,b-a);

}

int main() {

	ifstream fin;
	ofstream fout;

	fin.open("fractii.in");

	int n, result = 0;
	fin >> n;

	fin.close();

	fout.open("fractii.out");

	for (int i=1; i<n+1 ; ++i ) {
		for (int j = 1; j<i; ++j) {
			if (gcd(i,j)==1) ++result;
		}
	}
	result = result*2 + 1;
	fout << result;
	fout.close();

	return 0;
}