Remove from ends (Java)

import java.util.*;
import java.io.*;
import java.util.function.*;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] a = new int[n];
        for (int i = 0; i < n; i++)
            a[i] = sc.nextInt();

        long ans = Integer.MIN_VALUE, sum = 0;
        for (int x : a) {
            sum += x;
            ans = Math.max(ans, sum);
            if (sum < 0)
                sum = 0;
        }

        System.out.println(ans);
    }
}