n = int(input())
*d, = map(int,input().split())
x,y = map(int,input().split())

z = max(abs(x),abs(y))
d0 = max(d)
if z > d0:
    print((z+d0-1)//d0)
elif x==y==0:
    print(0)
else:
    if abs(x) in d or abs(y) in d:
        print(1)
    else:
        print(2)