def main():
    N = int(input())
    A = {j: i for i, j in enumerate(map(int, input().split()))}

    len_ = 0
    for i in range(N, 1, -1):
        if A[i] > A[i-1]:
            len_ += 1
        else:
            break
    print(N - 1 - len_)

main()