#include <iostream>
#include <fstream>
using namespace std;
ifstream in("fractii.in");
ofstream out("fractii.out");

int cmmdc(int a,int b)
{
    int r,aux;
    if (b>a)
    {
        aux=a;
        a=b;
        b=aux;
    }
    while (b!=0)
    {
        r=a%b;
        a=b;
        b=r;
    }
    return a;
}


int main()
{
    int n,k=0,p,q;
    in>>n;
    for (p=1;p<=n;p++)
    {
        for (q=1;q<=n;q++)
        {
            if (cmmdc(p,q)==1) k++;
        }
    }
    out<<k;
}