#include<stdio.h>

int main()
{
 freopen("fractii.in","r",stdin);
 freopen("fractii.out","w",stdout);
 long n,j;
 long double p,q;
 fscanf(stdin,"%ld",n);
 fclose(stdin);
  for(p=1;p<=n;p++)
   for(q=1;1<=n;q++)
    if(p/q!=(int)p/q || q==1)
     j++;
 fprintf(stdout,"%ld",j);
 fclose(stdout);
 return 0;
}