n = int(input(""))

w1,w2,h1,h2 = list(map(int,input("").split()))

volume = [int(n) for n in input("").split()]

a = [w1**2,w2**2]

h = [h1,h2]

delta = []

for vol in volume:

    height = vol/a[0]

    if height < h[0]:

        delta.append(height)

        h[0] -= height

    elif height >= h[0]:

        if len(a) == 2:

            extra = (a[0]*(height-h[0]))/a[1]

            delta.append(h[0]+ extra)

            a.pop(0)

            h.pop(0)

            h[0] -= extra

        else:

            delta.append(h[0])

            break

print(int(max(delta)))

在計算extra時要考慮是否超過h[1]