Judge if Close to a Multiple of 20

Background

Congcong is learning about number properties. He wants to write a program to determine if a given non-negative number satisfies a special condition.

Problem Description

Given a non-negative integer $n$, return true if $n$ is 1 or 2 less than a multiple of 20; otherwise, return false.

For example:

• For $n=38$, it is 2 less than $2 \times 20 = 40$, so return true.
• For $n=39$, it is 1 less than $2 \times 20 = 40$, so return true.
• For $n=40$, it is exactly a multiple of 20, which does not satisfy the condition, so return false.

Input Format

Input a non-negative integer $n$.

$n$

Output Format

Output true if the condition is met, otherwise output false.

true or false

Sample

18

true

19

true

20

false

Sample Explanation

• For $n=18$, it is 2 less than $1 \times 20 = 20$, so return true.
• For $n=19$, it is 1 less than $1 \times 20 = 20$, so return true.
• For $n=20$, it is exactly a multiple of 20, which does not satisfy the condition, so return false.

Constraints

Time limit: 1 second per test case. Memory limit: 1024 KiB per test case. $n$ is a non-negative integer.