#!/usr/bin/env python3
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines


# %%
N, *D, X, Y = map(int, read().split())
# %%
D_max = max(D)
x = max(abs(X), abs(Y))
if x == 0:
    answer = 0
elif x in D:
    answer = 1
else:
    answer = max(2, (x + D_max - 1) // D_max)
print(answer)

# %%