#include<iostream>
#include<fstream>
int main ()
{
	int n,p,q,k;
	std :: ifstream fin("fractii.in");
	std :: ofstream fout("fractii.out");
	fin>>n;
	k=0;
	for(p=1;p<=n;p++)
		for(q=1;q<=n;q++)
			if(p%q!=0 && p==q)
				k++;
				
			
	fout<<k;
	fin.close();
	fout.close();
	return 0;
}