#include<iostream>
#include<fstream>

using namespace std;
ifstream fin("fractii.in");
ofstream fout("fractii.out");
int gcd(int a, int b)
{
    if (b == 0)
        return a;
    return gcd(b, a % b);
}
int main()
{
    int z=0, n;
fin>>n;
       for(int i=1; i<=n; i++)
        for (int j =1; j<=n; j++)
            if(gcd(i, j)==1)
                z++;
    fout<<z;
    fin.close();
    fout.close();
    return 0;
}