#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/detail/standard_policies.hpp>
using namespace __gnu_pbds;
using namespace std;


#define LETS_GET_SCHWIFTY ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);  
#define ff              first
#define ss              second
#define int             long long
#define ll              long long
#define pb              push_back
#define pii             pair<int,int>
#define vi              vector<int>
#define mii             map<int,int>
#define pqb             priority_queue<int>
#define pqs             priority_queue<int,vi,greater<int> >
#define setbits(x)      __builtin_popcountll(x)
#define zerobits(x)      __builtin_ctzll(x)
#define mod             998244353
#define inf             1e18
#define ps(x,y)         fixed<<setprecision(y)<<x
#define vpii            vector<pair<int,int> >
#define all(x)          x.begin(),x.end()
#define matrixprint(arr,a,b,c,d) for(int i=a;i<=c;i++){for(int j=b;j<=d;j++){cout<<arr[i][j]<<" ";}cout<<"\n";}
#define show(arr,x,y)   for(int i=x;i<=y;i++){cout<<arr[i]<<" ";}cout<<"\n"
#define sz(x)           (int)x.size()
#define db(x)           cout<<x<<"\n";

const int N = 2e5 + 5;

#define TRACE
#ifdef TRACE
#define deb(...) __f(#__VA_ARGS__, __VA_ARGS__)
template <typename Arg1>
void __f(const char* name, Arg1&& arg1) {
    cout << name << " : " << arg1 << std::endl;
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args) {
    const char* comma = strchr(names + 1, ','); cout.write(names, comma - names) << " : " << arg1 << " | "; __f(comma + 1, args...);
}
#else
#define deb(...)
#endif

	
//////////////////////////////code//////////////////////////////

vi arr;

class BIT
{   
    public:
    
    int N;vector<int>bit;
    
    BIT(int n,int v)
    {   N=n;
        bit.assign(n,v);
    }
    
  void update(int idx,int val)
  {
      while(idx<N)
      {
          bit[idx]+=val;
          idx+= idx & (-idx);
      }
  }
  
   int sum(int idx)
   {  
       int ans=0;
       while(idx>0)
       {
           ans+=bit[idx];
           idx -= idx & (-idx);
       }
       return ans;
   }
   
   int rsum(int l,int r)
   {
       return sum(r)-sum(l-1);
   }
   
   	void updateMax(int idx, int val)
	{
		while(idx < N)
		{
			bit[idx] = max(bit[idx], val);
			idx += idx & -idx;
		}
	}
   
   	int prefMax(int idx)
	{
		int ans = -inf;
		while(idx > 0)
		{
			ans = max(ans, bit[idx]);
			idx -= idx & -idx;
		}
		return ans;
	}
	
 
    
};


void solve()
{
  //  cout << "-------------------" << "\n";
    
    int n;
    cin>>n;
    
    arr = vi(n+1);
    
    for(int i=1;i<=n;i++) cin>>arr[i];
    
    vi val(n+1);
    
    for(int i=1;i<=n;i++) cin>>val[i];
    
    BIT tree(200005,0);
    
    
    int ans = 0;
    
    for(int i = 1 ; i <= n ; i++)
    {
        int curr = tree.prefMax(arr[i]);
        
        ans = max(ans , val[i] + curr);
        
      //  deb(curr,arr[i],ans,val[i]);
        
        tree.updateMax(arr[i],val[i]+curr);
    }
    
    cout<<ans<<"\n";
    
  
 

 //   cout << "-------------------" << "\n";

}

int32_t main()
{

    LETS_GET_SCHWIFTY;

    int t = 1;
   // cin >> t;

    while (t--)
        solve();

}

// check out for following mistakes-
// if using pb operation on vector and then trying to access index..check if sizeof that vec could remain 0 only
// is using prime sieve make sure it fits
// when using factorial template or combinatorics make sure that you edit fillfac fun values and array values


Measured memory_bytes: 7932