N persons are standing in a row. The height of the i-th person from the front is A_i.  We want to have each person stand on a stool of some heights - at least zero - so that the following condition is satisfied for every person:  Condition: Nobody in front of the person is taller than the person. Here, the height of a person includes the stool.  Find the minimum total height of the stools needed to meet this goal.
N=int(input())
A = list(map(int, input().split()))
#print(A)
count=0
count2=0
for i in range(len(A)-1):
    if A[i]>A[i+1]:
        count=A[i]-A[i+1]
        #print(count)
        A[i+1]=A[i]
    count2+=count
print(count2)
N=int(input())
A = list(map(int, input().split()))
#print(A)
count=0
count2=0

for i in range(len(A)-1):
    #print(A[i])
    if A[i]>A[i+1]:
        count=A[i]-A[i+1]
        #print(count)
        A[i+1]=A[i]
        count2+=count

print(count2)
