Definition: In this task, you are given a list of integers you need to calculate and return the range of the integers which is the difference between maximum and minimum element in the list.
Input: [136, 71, 264, 213, 168, 416, 435, 215, 465, 114, 325, 93, 306, 212, 183, 455, 123, 274, 87, 412]
Output:
394