n = int(input())
step = [i for i in list(map(int,input().split()))]
goal = list(map(int,input().split()))
max_s = max(step)
max_g = max(abs(goal[0]),abs(goal[1]))
ans = 2

if max_s<max_g:
    ans = max_g//max_s
    if max_g%max_s != 0:
        ans += 1
elif max_g != 0:
    for i in step:
        if i==max_g:
            ans = 1
            break
else:
    ans = 0
print(ans)