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

int main()
{
    ifstream in;
    in.open("fractii.in");
    ofstream out;
    out.open("fractii.out");
    int nr,suma = 0;
    in >> nr;
    for(int i = 1 ; i <= nr ; i++ ){
        for( int j = 1; j <= nr ; j++){
            int aux = 0;
            for(int k = 2; k <= j ; k++)
                if(i % k == 0 && j % k == 0)
                        aux = 1;
            if(aux == 0) suma++;
        }
    }
    out << suma << endl;
    return 0;
}