input_line = input()
sequence_of_integers = list(map(int, input_line.split()))
remove_element = 0
sum_all_removed_elements = 0
while len(sequence_of_integers) != 0:
    item = int(input())
    if item < 0:
        remove_element = sequence_of_integers[0]
        sequence_of_integers[0] = sequence_of_integers[-1]
    elif item > len(sequence_of_integers) - 1:
        remove_element = sequence_of_integers[-1]
        sequence_of_integers[-1] = sequence_of_integers[0]
    else:
        remove_element = sequence_of_integers.pop(item)
    sequence_of_integers = [remove_element + x if x <= remove_element else x - remove_element
                            for x in sequence_of_integers]
    sum_all_removed_elements += remove_element
    remove_element = 0
print(sum_all_removed_elements)