class Difference: def __init__(self, a): self.__elements = a def computeDifference(self): maximum = 0 for i in range(len(self.__elements)): for j in range(len(self.__elements)): absolute = abs(self.__elements[i] - self.__elements[j]) if absolute > maximum: maximum = absolute self.maximumDifference = maximum # End of Difference class _ = input() a = [int(e) for e in input().split(' ')] d = Difference(a) d.computeDifference() print(d.maximumDifference)