#include <iostream>
#include <fstream>
//#include <conio.h>
using namespace std;
ifstream in ("fractii.in");
ofstream out("fractii.out");
int main()
{
 int n;
 int verificari=0;
 cin>>n;
 for (int i=1;i<n+1;i++)
 {
     for (int j=1;j<n+1;j++)
     {
          if((i%j!=0 && j%i!=0 ) || i==1 || j==1  )
                  verificari++;   
     }
 }
 cout<<verificari;
//  getch();
  return 0;
    
}