#include <fstream>
using namespace std;
ifstream f("fractii.in");
ofstream g("fractii.out");
int n,i,j,cont,t;
int cmmdc (int nr1, int nr2)
{
    while(nr2!=0)
    {
        t=nr2;
        nr2=nr1%nr2;
        nr1=t;
    }
    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;
}