#include <fstream>
using namespace std;

ifstream fin("fractii.in");
ofstream fout("fractii.out");

long counter;
float stiva[100001];

void nuContine(float x)
{
  bool contine = true;
  for(int i = 1; i <= counter && contine ; i++)
  if(x == stiva[i])
    contine = false;
  if(contine)
    stiva[++counter] = x;
}

int main()
{
  long n;
   fin >> n;
  for(int i = 1; i<= n; i++)
    for(int j = 1; j <= n; j++)
      nuContine(float(i)/float(j));
    fout << counter;
}