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#include <iostream>
#include <fstream>
#include <math.h>
using namespace std;
ifstream fin ("fractii.in");
ofstream fout ("fractii.out");
int
main ()
{
  int N, s = 0;
  fin >> N;
  for (int c = 1; c <= N; c++)
    for (int i = 2; i <= N; i++)
      {
	if (c % i != 0)
	  s++;
	if (c == 1)
	  s++;
      }
  fout << s;

  return 0;
}