#include <bits/stdc++.h>

using namespace std;

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

int main()
{
    int N,m,l;
    double P,Q,a[100];
    bool bol = false;

    in >> N;
    l=1;

    for (P=1; P<=N; P++)
    {
        for (Q=1; Q<=N; Q++)
        {
            for (int i=1; i<=l; i++)
            {
                if (a[i] == P/Q) //fractia a mai existat
                {
                    bol = true;
                }
            }
            if (bol == false)
                {
                    m++;
                    a[l] = P/Q;
                    l++;
                }
            bol = false;
        }
    }
    out << m;
    //in.close();out.close();
    return 0;
}