import sys

n = int(input())
a = list(map(int,input().split()))
max ,min = a[0],a[0]
#遍历整个数组，找出最大值和最小值，然后作差
for i in range(n):
    if a[i] > max :
        max = a[i]
    elif a[i] < min:
        min = a[i]

print(max-min)