#include<iostream>
#include<algorithm>
using namespace std;
int main (){
int n;
cin>>n;
int nums[1000001];
for (int i=0;i<n;i++){
cin>>nums[i];
}
for (int i=1;i<n;i++){
int sum=nums[i-1]+nums[i];
if (sum>nums[i]){
nums[i]=sum;
}
}
sort(nums,nums+n);
cout<<nums[n-1]<<endl;
return 0;
}
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