  Using variational methods, we establish existence of multi-bump solutions for
the following class of problems
  $$
  \left\{
  \begin{array}{l}
  \Delta^2 u +(\lambda V(x)+1)u = f(u), \quad \mbox{in} \quad \mathbb{R}^{N}, u
\in H^{2}(\mathbb{R}^{N}),
  \end{array}
  \right.
  $$ where $N \geq 1$, $\Delta^2$ is the biharmonic operator, $f$ is a
continuous function with subcritical growth and $V : \mathbb{R}^N \rightarrow
\mathbb{R}$ is a continuous function verifying some conditions.
