class Difference:
def __init__(self, a):
self.__elements = a
# Add your code here
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)
