from math import fabs
n = input()
f = lambda x: fabs(int(x))
d_list = list(map(int, input().split()))
gx, gy = map(f, input().split())

if gx == gy == 0:
	print(0); exit()
if gx == gy and gx in d_list:
	print(1); exit()

dis = gx + gy
max_d = max(d_list)
now_x, now_y, count = 0, 0, 0

while max(gx-now_x, gy-now_y) > max_d:
	if now_x + max_d <= gx:
		now_x += max_d
	if now_y + max_d <= gy:
		now_y += max_d
	count += 1

if count >= 2:
	print(count + 1)
else:
	print(count + 2)