#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#define ll              long long
#define pb              push_back
#define ppb             pop_back
#define endl            '\n'
#define mii             map<ll,ll>
#define pii             pair<ll,ll>
#define vi              vector<ll>
#define vs              vector<string>
#define all(a)          (a).begin(),(a).end()
#define F               first
#define S               second
#define sz(x)           (ll)x.size()
#define hell            1000000007
#define inf             (ll)1e18 + 5
#define PI              (double)3.14159265358979323844
#define DECIMAL(n)      cout << fixed << setprecision(n);
#define rep(i,a,b)      for (ll i=a;i<b;i++)
#define repr(i,a,b)     for (ll i=a-1;i>=b;i--)
#define bitcount(a)     (ll)__builtin_popcount(a)
#define lbnd            lower_bound
#define ubnd            upper_bound
#define mp              make_pair
#define ios             ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define ordered_set     tree<ll, null_type,less<ll>, rb_tree_tag,tree_order_statistics_node_update>
#define trace(...)      __f(#__VA_ARGS__, __VA_ARGS__)

template <typename Arg1>
void __f(const char* name, Arg1&& arg1){
    std::cerr << name << " : " << arg1 << endl;
}
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args){
    const char* comma = strchr(names + 1, ',');std::cerr.write(names, comma - names) << " : " << arg1<<" | ";__f(comma+1, args...);
}

using namespace std;
using namespace __gnu_pbds;

/*----------------------Graph Moves----------------*/
//const int fx[]={+1,-1,+0,+0};
//const int fy[]={+0,+0,+1,-1};
//const int fx[]={+0,+0,+1,-1,-1,+1,-1,+1};   // Kings Move
//const int fy[]={-1,+1,+0,+0,+1,+1,-1,-1};  // Kings Move
//const int fx[]={-2, -2, -1, -1,  1,  1,  2,  2};  // Knights Move
//const int fy[]={-1,  1, -2,  2, -2,  2, -1,  1}; // Knights Move
/*------------------------------------------------*/

//primes for hashing 937,991,1013,1409,1741

ll n;
const ll N=200005;
ll seg[4*N];
ll heights[N];
ll beauties[N];
ll dp[N];

ll query(ll cur,ll st,ll end,ll l,ll r) {
	if(l<=st&&r>=end)
	return seg[cur];
	if(r<st||l>end)
	return -inf;                           /*  2-change here  */
	ll mid=(st+end)>>1;
	ll ans1=query(2*cur,st,mid,l,r);
	ll ans2=query(2*cur+1,mid+1,end,l,r);
	return max(ans1,ans2);	                /*  3-change here  */
}

void update(ll cur,ll st,ll end,ll pos,ll upd) {
	if(st==end) {
		dp[pos]=max(upd,dp[pos]);					/*  4-change here  */
		seg[cur]=max(upd,seg[cur]);					/*  5-change here  */
		return;
	}
	ll mid=(st+end)>>1;
	if(st<=pos&&pos<=mid)
		update(2*cur,st,mid,pos,upd);
	else
		update(2*cur+1,mid+1,end,pos,upd);
	seg[cur]=max(seg[2*cur],seg[2*cur+1]);	/*  6-change here  */
}

void solve() {
    cin>>n;
    rep(i,0,n){
    	cin>>heights[i];
    }
    rep(i,0,n){
    	cin>>beauties[i];
    }
    rep(i,0,n){
    	dp[i]=max(query(1,0,N,0,heights[i]-1),(ll)0)+beauties[i];
    	update(1,0,N,heights[i],dp[i]);
    }
    // rep(i,0,50){
    // 	cout<<dp[i]<<" "<<heights[i]<<"    ";
    // }
    // cout<<endl;
    cout<<*max_element(dp,dp+n)<<endl;
}

signed main() {
    ios
    ll test=1;
    //cin>>test;
    while (test--) solve();
    return 0;
}


Measured memory_bytes: 10624