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())

# レアケース
if gx == gy == 0:
	print(0); exit()
if max(gx, gy) in d_list:
	print(1); exit()

count = max(gx, gy) / max(d_list)

if count - int(count) == 0:
	print(int(count))
elif count >= 1:
	print(int(count) + 1)
else:
	print(int(count) + 2)