#include <iostream>
#include <fstream>
long n,nr;
void main(){
std::ifstream in("fractii.in");
std::ofstream out("fractii.out");
in>>n;
for (long i=1;i<=n;i++)
 for (long j=1;j<=n;j++)
	 if ((i%j!=0)^(j==1 && i!=j))
		 nr=nr+1;
out<<nr;
}