n=int(input())
a=list(map(int,input().split()));a.sort()
x,y=map(int,input().split())
if max(abs(x),abs(y))==0:
	print(0)
	exit()
if max(abs(x),abs(y))<a[0]:
    print(2)
    exit()
z=max(abs(x),abs(y))
for i in range(n-1,-1,-1):
	if z>=a[i]:
		print((z+a[i]-1)//a[i])
		break