Write a Python program to keep track of an array of prices, and output the maximum and minimum price in the array.
[20, 40, 60, 5]
prices = [20, 40, 60, 5]

max_price = max(prices)
min_price = min(prices)

print('Max price is: ' + str(max_price))
print('Min price is: ' + str(min_price))