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) {
Scanner in = new Scanner(System.in);
int n = in.nextInt();
int[] an = new int[n];
for (int i = 0; i < n; i++) {
an[i] = in.nextInt();
}
long global = an[0];
long current = an[0];
for (int i = 1; i < n; i++) {
current = Math.max(an[i], current + an[i]);
global = Math.max(current, global);
}
System.out.println(global);
}
}

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