n,k=map(int,input().split())
a=list(map(int,input().split()))
c=list(map(lambda x:int(x)-1,input().split()))

def check(l0,r0,l1,r1):
  if l0==-1 or l1==-1:
    return False
  return min(r0,r1)+k>=max(l0,l1)

ans=0
inf=1<<60
dp=[[-inf]*n for i in range(n)]
color=[[-1,-1]*n for i in range(n)]
for d in range(n):
  for l in range(n):
    r=(l+d)%n
    if l==r:
      dp[l][r]=a[l]
      color[l][r]=[c[l],c[l]]
      continue
    for m in range(l,l+d):
      m%=n
      if dp[l][m]==-inf or dp[(m+1)%n][r]==-inf:
        continue
      l0,r0=color[l][m]
      l1,r1=color[(m+1)%n][r]
      if check(l0,r0,l1,r1):
        dp[l][r]=max(dp[l][r],dp[l][m]+dp[(m+1)%n][r])
        color[l][r]=[min(l0,l1),max(r0,r1)]
        # print(l,m,r,l0,r0,l1,r1)

for l in range(n):
  for r in range(n):
    ans=max(ans,dp[l][r])

print(ans)