Question: You work in a fishpond which has a computerized system. The system catches fishes when the fishes pass through a channel. Whenever it takes one fish, it does not have time to take the next fish.

Question: Write a program that defines the max amount to take (max total size) for all the fishes.

Input specification: First you will be given an integer, the number of fish (n). Then, starting from the following line, you will be given n integers (there may be several integers in every line - integers from 1 to 1000) where n is less than 250.

Output specification: Show one integer.

Explanation (Sample Input 1): If fish1 (5), fish4 (5), fish6 (4), and fish8 (3) are taken the max total size (17) are taken. (Sample Input 2): fish 1, 3, 5, 7 and 9 are taken (19).