n = int(input())
d = list(map(int,input().split(' ')))
x, y = map(int,input().split(' '))
x = abs(x)
y = abs(y)
if x > y: x,y = y,x

if y == 0:
    print(0)
elif y in d:
    print(1)
else:
    print(max(2,(y-1) // max(d) + 1))