#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 i=1;i<=N;i++)
        for (int j=1;j<=N;j++)
            if (i%j!=0 || (j==1 && i!=1))
                   c++;
    fout<<c;
    fout.close ();
}
int main ()
{
    long unsigned N;
    Citire(N);
    return 0;
}