#include <iostream>
#include <fstream>

using namespace std;

int Cmmdc(int a, int b)
{

    while(a != b)
    {
        if(a > b)
            a -= b;
        else
            b -= a;
    }
    return a;
}

int NrFractii(int n)
{
    int k=0;
    for(int i=1; i<=n; i++)
        for(int j=1; j<=n; j++)
            if(Cmmdc(i,j) == 1)
                k++;
    return k;
}

int main()
{
    int N;
    ifstream f("fractii.in");
    f >> N;
    f.close();
    ofstream g("fractii.out");
    g << NrFractii(N);
    g.close();
    return 0;
}