def test_pipes(pipes):
    tallest_pipe = max(pipes)
    capacity = 0
    for y in range(1, tallest_pipe + 1):
        possible_capacity = 0
        start = False
        for pipe in pipes:
            blah = pipe >= y
            if not start:
                start = blah
            else:
                if blah:
                    capacity += possible_capacity
                    possible_capacity = 0
                else:
                    possible_capacity += 1
    return capacity