#include<fstream>
//#include<iostream>
using namespace std;
int main(){
  ifstream fin("flip.in");
  ofstream fout("flip.out");
  int N,count;
  fin>>N;
  count=0;
  for (int i = 1; i <= N; i++) {
    for (int j = 1; j <= N; j++) {
      if(j == 1 || i == 1 ){
        //cout<<i<<"/"<<j<<" ";
          count++;
      }
      if((i%2==0 && j%2==0) || (i%3==0 && j%3==0)){

      }else if((i<=j && j%i!=0 ) || (i>j && i%j!=0)){
        //cout<<i<<"/"<<j<<" ";
          count++;
      }

    }
  }
  //cout<<endl;
  fout<<count;
  return 0;
}