def list3(a, b, c, *, val=0):
    return [[[val] * c for _ in range(b)] for _ in range(a)]


N, C = map(int, input().split())
L = list(map(int, input().split()))
W = list(map(int, input().split()))

sz = 51
dp = list3(sz, sz, sz)
for i in range(N):
    for j in range(N):
        if L[i] == L[j]: continue
        c = W[i] + W[j]
        if c > C: continue

        a = L[i]
        b = L[j]
        dp[c][a][b] = max(dp[c][a][b], a + b)

ans = 0
for i in range(sz):  # コスト
    for j in range(sz):  # 二つ前の門松
        for k in range(sz):  # 一つ前の門松
            if dp[i][j][k] == 0: continue
            for l, w in zip(L, W):
                if i + w > C: continue
                if (j < k > l or j > k < l) and j != l:
                    dp[i+w][k][l] = max(dp[i+w][k][l], dp[i][j][k] + l)

                ans = max(ans, dp[i+w][k][l])

print(ans)