Hello, World?

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {

	public static void main(String[] args) throws IOException {
		
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st = new StringTokenizer(br.readLine());
		
		int N = Integer.parseInt(st.nextToken());
		
		long dp[][] = new long[N][2];
		
		st = new StringTokenizer(br.readLine());
		for (int i = 0; i < N; i++) {
			dp[i][0] =Integer.parseInt(st.nextToken());
		}
		long max = -1;
		if(dp[0][0]> 0) { 
			dp[0][1] = dp[0][0];
		}
		max = dp[0][0];
		for (int i = 1; i < N; i++) {
			dp[i][1] = dp[i-1][1]+dp[i][0] > dp[i][0] ? dp[i-1][1]+dp[i][0] :dp[i][0];
			max = dp[i][1] > max ? dp[i][1] : max ;
		}
		
		System.out.println(max);

	}

}