#include<cstdio>
using namespace std;
int main ()
{
    FILE *f,*g;
    f=fopen("fractii.in","r");
    g=fopen("fractii.out","w");
    int i,p,q,n;
    fscanf(f,"%i",&n);
    i=0;
    for(p=1;p<=n;p++)
    {
        for(q=1;q<=n;q++)
        {
            if((p%q!=0)||(q==1)&&(p!=q))
            {
                i=i+1;
            }
        }
    }
    fprintf(g,"%i",i);
    return 0;
}