#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int n,i,j,cont;
int cmmdc (int nr1, int nr2)
{
    if(nr1<0)
    {
        nr1=-nr1;
    }
    if(nr2<0)
    {
        nr2=-nr2;
    }
    while(nr2!=nr1)
    {
        if(nr1>nr2)
        {
            nr1=nr1-nr2;
        }
        else
        {
            nr2=nr2-nr1;
        }
    }
    return nr1;
}
int main()
{
    f>>n;
    cont=0;
    for (i=1;i<=n;i++)
        for (j=1;j<=n;j++)
            if(cmmdc(i,j)==1)
                cont++;
    g<<cont;
}