#include <iostream>
#include <bits/stdc++.h>
using namespace std;
 
void max_score(vector<int>&dp,vector<int>&arr,vector<int>&arr2){
    int n=arr.size();
    dp[0]=max(arr[0],arr2[0]);
    dp[1]=max(dp[0],max(arr[1],arr2[1]));
    for(int i=2;i<n;i++){
        dp[i]=max(dp[i-1],max(arr[i]+dp[i-2],arr2[i]+dp[i-2]));
    }
 
}
int main(){
    int n;
    cin>>n;
    vector<int>arr(n);
    vector<int>arr2(n);
    for(int i=0;i<n;i++){
        cin>>arr[i];
    }
    for(int i=0;i<n;i++){
        cin>>arr2[i];
    }
 
 
    vector<int>dp(n);
    max_score(dp,arr,arr2);
    cout<<dp[n-1]<<"is the max score that be obtained from the arrays"<<endl;
    return 0;    
}

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5
2 3 4 -8 2
-5 8 3 1 -4