# 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(n)] for _2 in range(2 * n)]

# 初期化
for i in range(2 * n):
	c = c_list[i % n] - 1
	dp[i][0][c] = 1

# 区間DP
for d in range(1, n):
	for i in range(2 * n - d):
		for j in range(d):
			for c in range(50):
				if dp[i][d][c] == 0 and dp[i][j][c] == 1:
					if sum(dp[i + j + 1][d - j - 1][max(c - k, 0) : min(c + k + 1, 50)]) > 0:
						dp[i][d][c] = 1
						# print(i, d, c)
			for c in range(50):
				if dp[i][d][c] == 0 and dp[i + j + 1][d - j - 1][c] == 1:
					if sum(dp[i][j][max(c - k, 0) : min(c + k + 1, 50)]) > 0:
						dp[i][d][c] = 1
						# print(i, d, c)
		
res = 0
a_list_dup = a_list + a_list
for i in range(n):
	for d in range(n):
		if sum(dp[i][d]) > 0:
			res = max(res, sum(a_list_dup[i:i + d + 1]))

print(res)