import sys
readline=sys.stdin.readline

N,C=map(int,readline().split())
L=list(map(int,readline().split()))
W=list(map(int,readline().split()))
inf=1<<10
max_L=max(L)
dp=[[-inf]*(N**2) for c in range(C+1)]
for i in range(N):
    for j in range(N):
        for k in range(N):
            if W[i]+W[j]+W[k]<=C and L[i]!=L[k] and (L[i]-L[j])*(L[k]-L[j])>0:
                dp[W[i]+W[j]+W[k]][j*N+k]=L[i]+L[j]+L[k]
for c in range(C+1):
    for i in range(N):
        for j in range(N):
            for k in range(N):
                if L[i]!=L[k] and (L[i]-L[j])*(L[k]-L[j])>0 and c+W[k]<=C:
                    dp[c+W[k]][j*N+k]=max(dp[c+W[k]][j*N+k],dp[c][i*N+j]+L[k])
ans=max(max(dp[c]) for c in range(C+1))
if ans<0:
    ans=0
print(ans)