import sys

list_1 = []

for line in sys.stdin:
    a = line.split()
    list_1.append(a)

times = int(list_1[0][0])

i = 0
Max = 0
Min = 100000

while i != times:
    Max = max(int(list_1[1][i]), Max)
    Min = min(int(list_1[1][i]), Min)
    i += 1

print(Max - Min)