#include <iostream>
#include <fstream>
using namespace std;

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

int main()
{
    int N, cnt = 0;;
    cin >> N;
    int u, d = 1;

    while (d <= N) 
    {
        u = 1;
        while (u <= N)
        {
            if (d % u != 0)
                cnt++;
            u++;
        }

        d++;
    }
    
    fout << cnt;

    return 0;
}