#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("fractii.in");
ofstream fout("fractii.out");

const int NMAX = 1000001;

int n;

int main()
{
    fin >> n;
    int nr = 0;
    for (int i=1;i<=n;i++)
    {
        for (int j=i+1;j<=n;j++)
        {
            int k = 2;
            int p  = i * 2;
            int q = j * 2;
            while (p<=n && q<=n)
            {
                nr++;
                k++;
                p = i * k;
                q = j * k;
            }
        }
    }
    fout << n*n-((n-1) + 2 * nr);

    return 0;
}