Instructions: 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: [484, 249, 241, 189, 152, 391, 429, 275, 491, 132, 252, 56, 270, 408, 398, 167, 390, 256, 183, 120]
Output:
435