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

int cmmdc(int a, int b)
{
    if(b==0) return a;
    cmmdc(b,a%b);
}

int main()
{
    unsigned long n;
    ifstream f("fractii.in");
    ofstream g("fractii.out");

    f>>n;
    int fr=0;
    for(int i=1; i<=n; i++)
        for(int j=1; j<=n; j++)
                if(cmmdc(i,j)==1)
                    fr++;

                g<<fr;

    return 0;
}