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

int a[200010];

int main(){
	int n;
	cin >> n;
	int sum = 0,ans = 0;
	for(int i = 0;i < n;i++){
		cin >> a[i];
		if(i == 0){
			ans = a[0];
		}
		sum += a[i];
		ans = max(sum,ans);
		if(sum < 0) sum = 0; 
	}
	cout << ans << endl;
	return 0;
}