import math
N = int(input())
D = list(map(int,input().split()))
Gx,Gy = map(int,input().split())
if Gx == Gy == 0:
	answer = 0

elif max(abs(Gx), abs(Gy)) in D:
	answer = 1
elif max(abs(Gx),abs(Gy)) < max(D):
	answer = 2
elif max(abs(Gx), abs(Gy)) > max(D):
	a = max(abs(Gx), abs(Gy))
	b = max(D)
	answer = math.ceil(a / b)
print(answer)