2.28

package diyibufen;

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;


public class erbufen {
    
    public static int max(int a,int b) {
        return a>b?a:b;
    }
    
    public static void TurnToEnd() {
        System.out.println("ERROR!!!");
        System.exit(0);
    }
    public static void main(String[] args) throws IOException {
        int[] a=new int[10010];
        int[] res=new int[10010];
        int n;
        String[] s=new String[10000];
        BufferedReader br= new BufferedReader(new FileReader("E:/Java/diyibufen/input.txt"));
        s=br.readLine().split(",");
        n=Integer.parseInt(s[0]);
        
        
        s=br.readLine().split(",");
        if(s.length!=n) {
            TurnToEnd();
        }
        for(int i=1;i<=n;i++) {
            if(s[i-1].length()<9) {
                a[i]=Integer.parseInt(s[i-1]);
            }else {
                TurnToEnd();
            }
        }
        int k=a[0];
        for(int i=1;i<=n;i++) {
            if(res[i-1]<0) res[i]=a[i];
            else res[i]=a[i]+res[i-1];
            if(res[i]>1e9||res[i]<-1e9) {
                TurnToEnd();
            }
            k=max(k,res[i]);
        }
        
        System.out.println(k);
        
    }
}