#include <iostream>
#include <fstream>
using namespace std;

ifstream fin("fractii.in");
ofstream fout("fractii.out");

int main()
{
    int p,q,n,cont;
    fin>>n;
    cont=0;
    for(q=1;q<=n;q=q+1){
        for(p=1;p<=n;p=p+1){
           if(p%q!=0 && q%p!=0){
               cont=cont+1;
           }
           else{
               if(p==1 || q==1)
                    cont=cont+1;
           }    
        }
    }
    fout<<cont;
    
    return 0;
}