n=int(input())
lst=list(map(int,input().split()))

def max_and_min_of_list(lst):
    max=lst[0]
    min=lst[0]
    for i in lst:
        if i>max:
            max=i 
        if i<min:
            min=i
    return max,min

x,y=max_and_min_of_list(lst)
print(x-y)