#include <iostream>
#include <fstream>

using namespace std;

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

	int n;
	fin >> n;

	int nr = 0;

	for (int i = 1; i <= n; i++) {
		for (int j = 1; j <= n; j++)
			if (i == 1 || j == 1)
				nr++;
			else if (i > j && i % j)
					nr++;
				else if (j > i && j % i)
						nr++;
	}

	fout << nr;

	fin.close(), fout.close();
}