import sys
readline = sys.stdin.readline

n = int(input())
d_arr = list(map(int, readline().split()))
d_even = []
d_odd = []
for d in d_arr:
    if d % 2 == 0:
        d_even.append(d)
    else:
        d_odd.append(d)
d_even.sort()
d_odd.sort()
x, y = map(lambda n: abs(int(n)), input().split())

if x == 0 and y == 0:
    print(0)
    sys.exit()

for d in d_arr:
    if d == x + y:
        print(1)
        sys.exit()