#include <fstream>
using namespace std;

int main ()
{
	int n;
	int ct;
	int i, j;
	ifstream f("fractii.in");
	ofstream g("fractii.out");
	f>>n;
	ct=0;
	for(i=1;i<=n;i++)
		for(j=1;j<=n;j++)
			if(i%j!=0)
			ct++;
	g<<ct;
	return 0;
}