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

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

      return a;
}

void rezolvare()
{
    int k = 0;
    for (int i = 1; i <= n; i ++)
    {
        for(int j = 1; j <= n; j ++)
        {
            if(cmmdc(i, j) == 1)
                k ++;
        }
    }
   fout <<  k;
}

int main()
{

    fin >> n;
   rezolvare();

    return 0;
}