13. When the value of the natural number $n$ is taken as $1,2,3, \cdots, 2015$, the expression $\left[\frac{n}{2}\right]+\left[\frac{n}{3}\right]+\left[\frac{n}{5}\right]$ has $\qquad$ different values. (Note: $[x]$ represents the largest natural number not exceeding $x$)
Answer: 1479