#include <fstream>


using namespace std;

ifstream in("fractii.in");
ofstream out("fractii.out");

int cmmdc(int a, int b){
    int m;
    while (b!=0){
        m=b;
        b=a%b;
        a=m;
    }
    return a;
}

int main()
{
    int n, contor;
    in >> n;
    contor = 0;
    for(int i = 1; i<=n; i++){
        for(int j =1 ; j<=n; j++){

            if (cmmdc(i, j)== 1){
                contor = contor +1;
            }
        }
    }


    out << contor;


    in.close();
    out.close();
    return 0;
}