#include <iostream>
#include <fstream>


using namespace std;


int main()
{
	ifstream input("fractii.in");
	ofstream output("fractii.out");
	int n, r=0;
	input >> n;
	

	for (int i = 1; i <= n; i++)
	{
		for (int j = 1; j <= n; j++)
		{
			if ((j == 1) || (i == 1))
			{
				r++;

			}
			else if (((i%j) != 0) && ((j%i) != 0))
			{

				r++;
			}
			else if (((j%i) != 0) && ((i%j) != 0))

			{
				r++;
			}
		}

	}
	output << r;
	output.close();
	return 0;
}