Background

Description

Return the sum of the numbers in the array, returning 0 for an empty array. Except the number 13 is very unlucky, so it does not count and numbers that come immediately after a 13 also do not count.

Format

Input

Output

Samples

[1 2 2 1]

6

[1 1]

2

[1 2 2 1 13]

6

Limitation

1s, 1024KiB for each test case.