Special Sum

Background

Dawei is teaching Congcong basic arithmetic operations. To make it more interesting, Dawei gave Congcong a special sum problem.

Problem Description

Given two integers $a$ and $b$, return their sum. However, if the sum is in the range $10$ to $19$ (inclusive), the actual sum is forbidden. In that case, return $20$. Otherwise, return the actual sum.

Input Format

Input is given from Standard Input in the following format.

Two integers $a$ and $b$, separated by a space.

Output Format

Output to Standard Output in the following format.

An integer representing the sum calculated according to the rules.

Sample

3 4

7

9 4

20

10 11

21

Sample Explanation

• Sample 1: $3 + 4 = 7$. Since $7$ is not in the range $10$ to $19$, return $7$.
• Sample 2: $9 + 4 = 13$. Since $13$ is in the range $10$ to $19$, return $20$.
• Sample 3: $10 + 11 = 21$. Since $21$ is not in the range $10$ to $19$, return $21$.

Constraints

For all test cases: $0 \le a, b \le 100$ Time limit: 1s Memory limit: 1024KB