N = int(input())
D = list(map(int,input().split()))
x,y = map(int,input().split())
x0 = max(abs(x),abs(y))
maxd = max(D)
if x0 in D:
    print(1)
    exit()
if x0 < maxd:
    print(2)
    exit()
print(x0//maxd)