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# you can write to stdout for debugging purposes, e.g.
# print("this is a debug message")

def solution(A, B):
    # write your code in Python 3.6
    stack = []
    Sum = len(B)
    for i in range(len(B)):
        if B[i] == 1:
            stack.append(i)
        else:
            while stack != []:
                Sum -= 1
                if A[i] > A[stack[-1]]:
                    stack.pop()
                else:
                    break
    return Sum