#include <iostream>
#include <fstream>
#include <cmath>

using namespace std;

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

int main()
 
{
	ifstream fin("fractii.in");
	ofstream fout("fractii.out");
	int n;
	fin >> n;
	//cin >> n;
	
	int k=0;
	for (int i = 1; i <= n; i++)
		for (int j = 1; j <= n; j++)	
		{
			if (i >= j)
				if (gcd(i, j) == 1){
					//cout << gcd(i, j) << " ";
					k++;
			    }
			if (i < j)
				if (gcd(j, i) == 1) 
				{
					//cout << gcd (j, i) << " ";
					k++;
				}
		}
	fout << k;
	//cout << gcd(1,1) << gcd(2,1) << gcd(3,1) << gcd(2,1) << gcd(2,2) << gcd(3,2) << gcd(3,3);
}