#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>
#define rep(i,n) for(ll i=0;i<(n);++i)
#define reps(i,n) for(ll i=1;i<=(n);++i)
#define repr(i,n) for(ll i=2;i*i<=(n);++i)
#define ll long long
#define all(x) (x).begin(),(x).end()
#define sz(x) ((string)(x).size())
#define pb push_back
#define pob pop_back()
#define setp(x) setprecision((ll)(x))
#define INF (ll)(1000000000000000000)
#define mp make_pair
using namespace std;
using pii=pair<int, int>;
using pll=pair<ll,ll>;
using vi=vector<int>;
using vc=vector<char>;
using vb=vector<bool>;
using vl=vector<long long>;
using vvi=vector<vi>;
using vvl=vector<vl>;
using vvc=vector<vc>;
using vvb=vector<vb>;
using vpi=vector<pii>;
using vpl=vector<pair<ll,ll>>;
using vs=vector<string>;
using pqi=priority_queue<int>;
using vld=vector<long double>;
vpi fs={mp(1,0),mp(-1,0),mp(0,1),mp(0,-1),mp(1,1),mp(1,-1),mp(-1,-1),mp(-1,1)};
const ll inf=1e18;

int main(){
  ll n,m; cin>>n>>m;
  vl p(n),q(n);
  rep(i,n) cin>>p[i];
  rep(i,n) cin>>q[i];
  vvl dp(n+1,vl(m+10,-1));
  dp[0][0]=0;
  rep(i,n){
    rep(j,m+5){
      if(dp[i][j]==-1) continue;
      dp[i+1][j]=max(dp[i][j],dp[i+1][j]);
      dp[i+1][min(j+q[i],m+5)]=max(dp[i+1][min(j+q[i],m+5)],dp[i][j]+p[i]);
    }
  }
  ll ma=0;
  rep(i,m) ma=max(ma,dp[n][i]);
  cout<<ma<<endl;
  return 0;
}