Nearest to 21

Background

This is a simple number game where you need to determine which number is closer to a target value based on given rules.

Problem Description

Given two integer values greater than $0$, return whichever value is nearest to $21$ without going over. Return $0$ if they both go over.

Input Format

Input consists of two integers, separated by a space.

$a$ $b$

Output Format

Output a single integer, representing the value nearest to $21$ without going over, or $0$.

result

Sample

19 21

21

21 19

21

19 22

19

Sample Explanation

• Sample 1: Given $19$ and $21$. $21$ is nearest to $21$ and does not go over.
• Sample 2: Given $21$ and $19$. $21$ is nearest to $21$ and does not go over.
• Sample 3: Given $19$ and $22$. $19$ does not go over $21$, while $22$ does. Thus, $19$ is returned.

Constraints

Time limit for each test case is $1$ second, and memory limit is $1024$ KiB.