## https://yukicoder.me/problems/no/2547


def main():
    N = int(input())
    A = list(map(int, input().split()))
    B = list(map(int, input().split()))

    answer = 0
    for i in range(N):
        if A[i] <= B[i]:
            answer += 1
    print(answer)




if __name__ == "__main__":
    main()