#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define FORR(i,a,b) for(int i=(a);i>=(b);i--)
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define pcnt __builtin_popcount
#define sz(x) (int)(x).size()
#define maxs(x,y) x=max(x,y)
#define mins(x,y) x=min(x,y)
#define show(x) cout<<#x<<" = "<<x<<endl;
#define all(a) (a.begin()),(a.end())
#define each(it,c) for(__typeof((c).begin()) it=(c).begin();it!=(c).end();it++)
#define perm(c) sort(all(c));for(bool c##p=1;c##p;c##p=next_permutation(all(c)))
#define bit(n) (1LL<<(n))
#define randInt(l,r) (uniform_int_distribution<ll>(l,r)(rnd))
#define randDouble(l,r) (uniform_real_distribution<double>(l,r)(rnd))

typedef long long ll;
typedef __int128_t lll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
template<class T>using V=vector<T>;
template<class T>using VV=V<V<T>>;
template<class T,class Y>ostream& operator<<(ostream& o,const pair<T,Y>& p){return o<<"("<<p.fi<<", "<<p.se<<")";}
template<typename A,size_t N,typename T>void Fill(A (&array)[N],const T&v){fill((T*)array,(T*)(array+N),v);}
lll gcd(lll a,lll b,lll &x,lll &y){if(!b){x=1;y=0;return a;}lll d=gcd(b,a%b,y,x);y-=a/b*x;return d;}
ll gcd(ll a,ll b){lll x=0,y=0;return gcd(a,b,x,y);}
ll modPow(lll a,lll n,ll m){if(!a)return a;lll p=1;for(;n>0;n>>=1,a=a*a%m)if(n&1)p=p*a%m;return(ll)p;}
bool isPrime(ll n){if(n<2||n%2==0)return n==2;lll t=n-1,d=t/(t&-t);for(lll a:{2,325,9375,28178,450775,9780504,1795265022})if(a%n){for(t=d,a=modPow(a,t,n);t!=n-1&&a!=1&&a!=n-1;a=a*a%n,t=t*2%n);if(a!=n-1&&t%2==0)return 0;}return 1;}
void dout(double d){printf("%.12f\n",d);}
const int IINF = 1e9+6;
const ll LINF = 1e18;
const int MOD = 1e9+7;
const double PI = acos(-1);
const double EPS = 1e-10;
static random_device rd;
static mt19937 rnd(rd());
const int N = 1e5;
int n, c, W[52], DP[52][52][51];
V<int> L;
main(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  cin >> n >> c;
  Fill(DP, -IINF);
  Fill(W, 100);
  W[0]=0;
  W[51]=0;
  FOR(i, 0, n){
    int l;
    cin >> l;
    L.pb(l);
  }
  FOR(i, 0, n){
    int w;
    cin >> w;
    mins(W[L[i]], w);
  }
  sort(all(L));
  L.erase(unique(all(L)), L.end());

  n=sz(L);

  DP[0][51][0] = 0;
  DP[51][0][0] = 0;
  FOR(t, 0, c)FOR(i, 0, n)FORR(j, c-W[L[i]], 0){
    FOR(k, 0, L[i])FOR(l, k+1, 52) if(l!=L[i]) maxs(DP[k][L[i]][j+W[L[i]]], DP[l][k][j]+L[i]);
    FOR(k, L[i]+1, 52)FOR(l, 0, k) if(l!=L[i]) maxs(DP[k][L[i]][j+W[L[i]]], DP[l][k][j]+L[i]);
  }
  int ans=0;
  FOR(i, 0, n)FOR(j, 0, n)FOR(k, 3, 51) if(k > W[L[i]]+W[L[j]]) maxs(ans, DP[L[i]][L[j]][k]);
  cout << ans << endl;
}