#include <bits/stdc++.h>
using namespace std;

template<class T> istream& operator >> (istream& is, vector<T>& vec) {
    for(T& x : vec) is >> x;
    return is;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin >> n;
    vector<int> a(n), b(n);
    cin >> a >> b;
    vector<vector<int>> g(500001);
    vector<bool> used(500001);
    for(int i = 0; i < n; i++){
        g[a[i]].emplace_back(a[i] + b[i]);
    }
    queue<int> que;
    que.emplace(1);
    int ans = 1;
    while(!que.empty()){
        int v = que.front();
        que.pop();
        for(auto &&u : g[v]){
            ans = max(ans, u);
            if(u <= 500000 && !used[u]){
                used[u] = true;
                que.emplace(u);
            }
        }
    }
    cout << ans << '\n';
}