# Evaluate Reverse Polish Notation

Evaluate the value of an arithmetic expression in Reverse Polish Notation.

Valid operators are `+`

, `-`

, `*`

, `/`

. Each operand may be an integer or another expression.

For more information, please see reversed polish notation.

Example

```
Input Equivalent Result
["2", "1", "+", "3", "*"] ((2 + 1) * 3) 9
["4", "13", "5", "/", "+"] (4 + (13 / 5)) 6
```