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

int main()
{
    fstream f("fractii.in",ios::in);
    fstream g("fractii.out",ios::out);
    int i,j,n,x=0;
    f>>n;
    for (i=2;i<=n;i++)
        for (j=1;j<=n;j++) 
           {
               if (i%j && j%i || j==1) 
               {
                      x++;
               }
           }
    g<<x+n;
    f.close(); g.close();
    return 0;
}