#include <fstream>
using namespace std;
int main(void)
{
	unsigned n,k=0,i,j;
	ifstream f("fractii.in");
	ofstream g("fractii.out");
	f>>n;
	for (i=1;i<=n;i++)
	{
		for (j=1;j<=n;j++)
		{
			if (i%j!=0 || j%i!=0)
				k++;
		}
	}
	k--;
	g<<k;
	
	f.close();
	g.close();
	return 0;
}