//By Tushar Gautam
#pragma GCC optimize ("-O2")
#include <bits/stdc++.h>
using namespace std;
#define fastio ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define all(x) x.begin(),x.end()
#define memreset(a) memset(a,0,sizeof(a))
#define testcase(t) int t;cin>>t;while(t--)
#define forstl(i,v) for(auto &i: v)
#define forn(i,e) for(int i = 0; i < e; i++)
#define forsn(i,s,e) for(int i = s; i < e; i++)
#define rforn(i,s) for(int i = s; i >= 0; i--)
#define rforsn(i,s,e) for(int i = s; i >= e; i--)
#define leadzero(a) __builtin_clz(a) // count leading zeroes
#define trailzero(a) __builtin_ctz(a) // count trailing zeroes
#define bitcount(a) __builtin_popcount(a) // count set bits (add ll)
#define ln "\n"
#define dbgarr(v,s,e) cerr<<#v<<" = "; forsn(i,s,e) cerr<<v[i]<<", "; cerr<<endl
#define inputfile freopen("input.txt", "r", stdin)
#define outputfile freopen("output.txt", "w", stdout)
#define dbg(args...) { string _s = #args; replace(_s.begin(), _s.end(), ',', ' '); \
stringstream _ss(_s); istream_iterator<string> _it(_ss); err(_it, args); }
void err(istream_iterator<string> it) { cerr<<endl; }
template<typename T, typename... Args>
void err(istream_iterator<string> it, T a, Args... args) {
	cerr << *it << " = " << a << "\t"; err(++it, args...);
}
template<typename T1,typename T2>
ostream& operator <<(ostream& c,pair<T1,T2> &v){
	c<<"("<<v.fi<<","<<v.se<<")"; return c;
}
template <template <class...> class TT, class ...T>
ostream& operator<<(ostream& out,TT<T...>& c){
    out<<"{ ";
    forstl(x,c) out<<x<<" ";
    out<<"}"; return out;
}
typedef long long int  ll;
typedef long double  ld;
typedef pair<ll,ll> p64;
typedef pair<int,int> p32;
typedef pair<int,p32> p96;
typedef vector<ll> v64;
typedef vector<int> v32; 
typedef vector<v32> vv32;
typedef vector<v64> vv64;
typedef vector<p32> vp32;
typedef vector<vp32> vvp32;
typedef map<int,int> m32;
const int LIM = 1e5+5, MOD = 1e9+7;
int n,m,k,x,y;
const int MAXN= 2e5+5;
ll t[4*MAXN];
ll combine(ll a,ll b){
	return max(a,b);
}
void build(ll a[], int v, int tl, int tr) {
    if (tl == tr) {
        t[v] = a[tl];
    } else {
        int tm = (tl + tr) / 2;
        build(a, v*2, tl, tm);
        build(a, v*2+1, tm+1, tr);
        t[v] = combine(t[v*2], t[v*2+1]);
    }
}
ll get_max(int v, int tl, int tr, int l, int r) {
    if (l > r)
        return -1e18;
    if (l == tl && r == tr)
        return t[v];
    int tm = (tl + tr) / 2;
    return combine(get_max(v*2, tl, tm, l, min(r, tm)), 
                   get_max(v*2+1, tm+1, tr, max(l, tm+1), r));
}
void update(int v, int tl, int tr, int pos, ll new_val) {
    if (tl == tr) {
        t[v] = new_val;
    } else {
        int tm = (tl + tr) / 2;
        if (pos <= tm)
            update(v*2, tl, tm, pos, new_val);
        else
            update(v*2+1, tm+1, tr, pos, new_val);
        t[v] = combine(t[v*2], t[v*2+1]);
    }
}
int main(){
	fastio;
	cin>>n;
	p32 h[n];
	ll val[n];
	forn(i,n){
		cin>>h[i].fi; h[i].se=i;
	}
	forn(i,n) cin>>val[i];
	sort(h,h+n);
	ll a[n]={0};
	build(a,1,0,n-1);
	rforn(i,n-1){
		auto r=get_max(1,0,n-1,h[i].se,n-1);
		a[h[i].se]=r+val[h[i].se];
		update(1,0,n-1,h[i].se,a[h[i].se]);
	}
	cout<< get_max(1,0,n-1,0,n-1) <<ln;
	return 0;
}

Measured memory_bytes: 11136