n=int(input())
D=list(map(int,input().split()))
x,y=map(int,input().split())
MAX=max(D)

x=abs(x)
y=abs(y)

if x==y==0:
    print(0)
    exit()

if max(x,y)<MAX:
    if max(x,y) in D:
        print(1)
    else:
        print(2)
    exit()

ANS=max(x,y)//MAX
r=max(x,y)%MAX

if r==0:
    print(ANS)
else:
    print(ANS+1)