import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        //连续子数组的最大值
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int [] arr = new int[n];
        for (int i = 0; i < n; i++) {
            arr[i] = sc.nextInt();
        }
        int sum = arr[0];
        for (int i = 1; i < n; i++) {
            arr[i] += Math.max(arr[i - 1], 0);
            sum = Math.max(sum, arr[i]);
        }
        System.out.println(sum);
    }
}