def read_data():
    n = int(input())
    ds = list(map(int, input().split()))
    x, y = map(int, input().split())
    return n, ds, x, y

def solve(n, ds, x, y):
    max_d = max(ds)
    z = max(abs(x), abs(y))
    if z == 0:
        return 0
    if z in ds:
        return 1
    if z <= 2 * max_d:
        return 2
    s, r = divmod(z - 2 * max_d, max_d)
    if r:
        s += 1
    if r == 0:
        return s + 2
    if r in ds:
        return s + 1
    else:
        return s + 2

n, ds, x, y = read_data()
print(solve(n, ds, x, y))