Given a list of integers, compute the sum of the nonzero ones.

In the event the list contains no nonzero integers, the desired sum is zero.

Constraints

~1 \le N \le 10~

~-5 \le a_i \le 5~

In tests worth 5 marks, all ~a_i~ are nonzero.

Input Specification

The first line contains a single integer ~N~.

The next ~N~ lines each contain a single integer, ~a_i~, representing the ~i~th integer in the list.

Output Specification

On a single line, output the sum of the nonzero integers.

Sample Input

10
0
0
0
0
0
0
0
0
0
0

Sample Output

0

Sample Input

2
1
-2

Sample Output

-1