#!/bin/python3

import sys

def largestValue(A):
    
    
     
    max_so_far = 0
    max_ending_here = 0
     
    for i in range(0, size):
        max_ending_here = max_ending_here + a[i]
        if max_ending_here < 0:
            max_ending_here = 0
         
        
        elif (max_so_far < max_ending_here):
            max_so_far = max_ending_here
             
    return max_so_far

if __name__ == "__main__":
    n = int(input().strip())
    A = list(map(int, input().strip().split(' ')))
    result = largestValue(A)
    print(result)