#include <fstream>

int N, k=0, i, j;

using namespace std;

int cmmdc(int a, int b)
{
    int aux;
    while(b)
    {
        aux=b;
        b=a%b;
        a=aux;
    }
    return a;
}

int main()
{
    fstream f("fractii.in", ios::in);
    fstream g("fractii.out", ios::out);
    f>>N;
    for(i=1; i<=N; i++)
        for(j=1; j<=N; j++)
            if(cmmdc(i,j)==1) k++;
    g<<k;
}