# your code goes here
x = [5,8,-10,2,5,5]

prefix = [0] * len(x)
prefix[0] = x[0]

for i in range(1, len(x)):
	prefix[i]=prefix[i-1]+x[i]

max_sum=0
for i in range(1, len(x)):
	max_sum = max(prefix[i-1] + x[i], x[i])

print(max_sum)