/*
    Nume:Temian
    Date:
    Problema:
*/
#include <iostream>
#include <fstream>
using namespace std;

int main()
{
    ifstream fin("fractii.in");
    ofstream fout("fractii.out");
    unsigned long int q,i,n,c=0,j,b;
    fin>>n;
    fin.close();
    for(i=1;i<=n;i++)
    {
    				 for(q=1;q<=n;q++)
				{
				    if(q!=i)		   
	                     {b=0;
                          for(j=2;j<=i;j++)
                             if(i%j==0&&q%j==0){b=1;break;}
                          if(b==0)c++;}  
		          }
                           
    }
    fout<<c+1;
    fout.close();
    system ("pause");
    return 1;
}