# Maximum sum in sequence

MEDIUMGiven a string of integers separated by a single space.

Find a sequence of numbers in which the sum of the elements is maximum.

For example, for string "2, -5, 1, 2, -2, 2" solution is the sequence "1 2" with sum = 3.

Print max sum only.

### Example #1

#### Input

-8 -3 -6 -2 -5 -4

#### Output

-2

### Example #2

#### Input

-2 1 -3 4 -1 2 1 -5 4

#### Output

6