Background

Description

Given 3 int values, a b c, return their sum. However, if one of the values is 13 then it does not count towards the sum and values to its right do not count. So for example, if b is 13, then both b and c do not count.

Format

Input

Output

Samples

1 2 3

6

1 2 13

3

1 13 3

1

Limitation

1s, 1024KiB for each test case.