# 区間DPで、区間ごとに最後に残すことができる石を考える


n, k = map(int, input().split())
a_list = list(map(int, input().split()))
c_list = list(map(int, input().split()))
sum_a = sum(a_list)

dp = [[[0] * 50 for _1 in range(2 * n)] for _2 in range(2 * n)]

# 初期化
for i in range(2 * n):
	c = c_list[i % n] - 1
	dp[i][i][c] = 1

# 区間DP
for d in range(1, n):
	for i in range(2 * n - d):
		for j in range(d):
			dp[i][i + d][c] = dp[i][i + j][c] * dp[i + j + 1][i + d][c] 

print(0)