#include <fstream>
using namespace std;

void Citire (long unsigned &N)
{
    ifstream fin ("fractii.in");
    ofstream fout("fractii.out");
    fin>>N;
    fin.close ();
    int  c=0;
    for (int P=1;P<=N;P++)
        for (int Q=1;Q<=N;Q++)
            if (P%Q!=0 || (Q==1 && P!=1))
                   c++;
    fout<<c;
    fout.close ();
}
int main ()
{
    long unsigned N;
    Citire(N);
    return 0;
}