def equalStacks(h1, h2, h3):
    x1,x2,x3=sum(h1),sum(h2),sum(h3)
    while True:
        if x1==x2 and x2==x3:
            break
        elif x1>=x2 and x1>=x3:
            val=h1[0]
            x1-=val
            del h1[0]
        elif x3>=x2 and x3>=x1:
            val=h3[0]
            x3-=val
            del h3[0]
        elif x2>=x1 and x2>=x3:
            val=h2[0]
            x2-=val
            del h2[0]
    return x1