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

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

int main()
{
    int n,nr=0;
    F>>n;
    for (int i=1; i<=n; i++)
    {
        for (int j=1; j<=n; j++)
        {
           if (cmmdc(i,j)==1) nr++;
        }
    }
    G <<nr;


}