var f,g:text;
    xa1,xa2,xa3,x1,x2,x3,aux,n,i,j,p,q,r,nr:longint;
begin
  assign(f,'fractii.in'); reset(f);
  assign(g,'fractii.out'); rewrite(g);
  read(f,n);
  for i:=1 to n do
    for j:=1 to n do
      begin
        p:=i;
        q:=j;
        r:=p mod q;
        while r<>0 do
          begin
            p:=q;
            q:=r;
            r:=p mod q;
          end;
        if q=1 then inc(nr);
      end;
  writeln(g,nr);
  close(f); close(g);
end.