Let $f:$ $\mathbb{R}$ $\rightarrow$ $\mathbb{R}$ a $C^1$ diffeomorphism,
 $x\in\Omega(f)$.$\space$

How do i proove that $\forall\space\epsilon\gt0$, $\exists\space$ $g:$$\mathbb{R}$ $\rightarrow$ $\mathbb{R}$ with $d(f,g)\lt\epsilon$ $\space$
such that $x\in Per(g)$

$\Omega(f)=$ \{ $y\in\mathbb{R}\mid\space\forall\space U, y\in U, $ there is $n\ge1 $ such that $f^n(U) \cap U\neq\emptyset $ \}

The distance is given by the uniform convergence of the functions and their first derivative.