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);
}
}

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