#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream fin("fractii.in");
    ofstream fout("fractii.out");
    int N,fina = 0;
    fin>>N;
    for(int i = 1;i <= N;i++){
        for(int j = 1;j <= N;j++){
            if((i % j != 0 && j % i != 0) || (j == 1 || i == 1)){
                fina++;
            }
        }
    }
    fout<<fina;
}