#include <fstream>
#include <iostream>

using namespace std;

int euclid(int a, int b)
{
	int c;
	while (b) {
		c = a % b;
		a = b;
		b = c;
	}
	return a;
}

int main()
{
	int N;

	ifstream fin("fractii.in");
	ofstream fout("fractii.out");

	fin >> N;
	
	int sum = N;

	for (int i = 2; i <= N; i++)
	{
		for (int j = 1; j <= N; j++)
		{
			if (j == 1)
			{
				sum++;
			}
			else
			{
				if (euclid(i, j) == 1)
				{
					sum++;
				}
			}
		}
	}

	fout << sum;

	return 0;
}