#include <iostream>
#include <fstream>

using namespace std;

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

    int N;
    fin >> N;

    int t = N;

    for(int p = 2; p <= N; p++)
        for(int q = 1; q <= N; q++)
            if(q == 1)
                t++;
            else
                if(p % q != 0 && q % p != 0)
                    t++;

    fout << t;
    return 0;
}