from collections import deque

  h1, h2, h3 = deque(h1), deque(h2), deque(h3)
    sum1, sum2, sum3 = sum(h1), sum(h2), sum(h3)
    while not (sum1 == sum2 == sum3):
        m = min(sum1, sum2, sum3)
        if sum1 > m:
            sum1 -= h1.popleft()
        elif sum2 > m:
            sum2 -= h2.popleft()
        elif sum3 > m:
            sum3 -= h3.popleft()
    return sum1