#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream x("fractii.in");
    ofstream y("fractii.out");

    int n,p,q,nr;

    nr=0;
    x>>n;

    p=1;


    while (p<=n)
        {   q=1;
            while (q<=n)
            {if(p%q!=0 or q==1) nr++;
            q++;}
        p++;}


    y<<nr;

    x.close();
    y.close();

    return 0;

}