#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    int p,q;
    int c;
    int n;

    ifstream fin ("fractii.in");

    fin>>n;

    fin.close();

    p=1;
    q=1;

    for (p, p<=n, p++) {


    for (q=1, q<=n, q++) {
        if (p%q!=0) {

            c++;
        }
    }
    }

    ofstream fout ("fractii.out");

    fout<<c;
    fout.close();

    return 0;
}