#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) || ((i%j) != 0) || ((j%i) != 0))
				r++;
		}
	}
	output << r;
	output.close();
}