#include <iostream>
#include <fstream>

using namespace std;

int main(){
  ifstream f("fractii.in");
  ofstream g("fractii.out");
  int n, nrf = 1;
  f >> n;
  for (int i = 1; i<= n; i++){
    for(int j = 1; j<= n; j++){
      if (i % j != 0){
        nrf++;
      }else if ( j % i != 0){
        nrf++;
      }
    }
  }
  g << nrf;
  return 0;
}