#include <iostream>
#include <fstream>
using namespace std;
ifstream in("fractii.in");
ofstream out("fractii.out");
int main()
{
    int n,cont=0,i,j;
    in>>n;
    cont=n+n-1;
    for(i=2;i<=n;i++)
    {
          for(j=2;j<=n;j++)
          {

            if((i%2==0&&j%2==0)||(i%3==0&&j%3==0)||(i%5==0&&j%5==0)||(i%7==0&&j%7==0));

                         else
                            if(j%i!=0)
                                if(i%j!=0)
                                      cont++;


                  }
          }

    out<<cont;
    return 0;
}