#include<fstream.h>
#define fin "fractii.in"
#define fout "fractii.out"
int main()
{	long n,a,b,s=0;
	ifstream in(fin);
	in>>n;
	a=n;
	while(a!=0)  {  for(b=1;b<=n;b++) { if(b!=a && a%b!=0) s=s+1;
					    if(a==b && a==b==1) s=s+1;
					  }
					     a--;
                     }
	ofstream out(fout);
	out<<s<<"\n";
	out.close();
	return 0;
}