#include <fstream>
using namespace std;
ifstream in("fractii.in");
ofstream out("fractii.out");
unsigned long long nr;
int n;
int cmmdc(int x,int y)
{
    int r;
    do
    {
        r=x%y;
        x=y;
        y=r;
    }while(y);
    return x;
}
int main()
{
    in>>n;
    for(int p=1;p<=n;p++)
        for(int q=1;q<=n;q++)
        if(cmmdc(p,q)==1) ++nr;
    out<<nr;
}