  We consider the structure $(\mathbb{Z},+,0,|_{p_{1}},\dots,|_{p_{n}})$, where
$x|_{p}y$ means $v_{p}(x)\leq v_{p}(y)$ and $v_p$ is the $p$-adic valuation. We
prove that its theory has quantifier elimination in the language
$\{+,-,0,1,(D_{m})_{m\geq1},|_{p_{1}},\dots,|_{p_{n}}\}$ where
$D_m(x)\leftrightarrow \exists y ~ my = x$, and that it has dp-rank $n$. In
addition, we prove that a first order structure with universe $\mathbb{Z}$
which is an expansion of $(\mathbb{Z},+,0)$ and a reduct of
$(\mathbb{Z},+,0,|_{p})$ must be interdefinable with one of them. We also give
an alternative proof for Conant's analogous result about $(\mathbb{Z},+,0,<)$.
