Simple Array Sum

A market stall keeps its books on one line per day: every transaction of the day written out in order, separated by spaces. A sale is a positive number and a refund is a negative one. At closing time the stallholder wants the day's net figure.

Task: Read one day's transactions and print their total.

Input

A single line holding between 1 and 100 integers, separated by single spaces. Any of them may be negative or zero. The count is not given anywhere — the line holds whatever it holds.

Output

One line holding a single integer: all the values on the line added together.

Example:

Input:
1 2 3 4 5

Output:
15