E

T, W, Y, V = map(int, input().split(' '))

N = int(input())
cols = list(map(int, input().split(' ')))

K = int(input())
cars = list(map(int, input().split(' ')))

res = T*K

if V + Y == 0:
    for car in cars:
        for col in cols:
            pass


for car in cars:
    for col in cols:
        w = col
        ts = (w-car+w*Y)/(V+Y)

        w = col+W
        tf = (w - car + w * Y) / (V + Y)

        if ts <= 0:
            ts = 0
        if tf <= 0:
            tf = 0
        if ts >= T:
            ts = T
        if tf >= T:
            tf = T

        res -= abs(tf-ts)
        # print('Start: {} \nFinish: {}\n---'.format(ts,tf))

    # print('*'*20)

print(res)