import sys


def input(): return sys.stdin.readline().rstrip('\n')


def main():
    a, b, c = map(int, input().split())
    x, y, z = map(int, input().split())
    a, b, c = sorted([a + a + b + b, a + a + c + c, b + b + c + c])
    x, y, z = sorted([x, y, z])
    return a * z + b * y + c * x


if __name__ == '__main__':
    ret = main()
    if ret is not None:
        print(ret)