Divisible by 3
Programming Basics · Python
TASK
Problem
Print `YES` if integer `n` is divisible by 3, otherwise `NO`.
EXAMPLE
Example
18
YES
LIMITS
Constraints
All integer inputs have absolute value at most 10^9; any additional relationships between them are stated directly in the task.
LEARN
Theory for this problem
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`input()` reads data entered by the user. The result of `input()` is initially a string. `int()` converts a numeric string into an integer. The `%` operator returns the remainder after division. Comparison operators `==`, `!=`, `<`, `>`, `<=`, `>=` compare values and produce `True` or `False`. `if` checks a condition and runs its block when the condition is true. `else` runs when the corresponding `if` condition is false. `print()` displays the program result. Print only what the problem statement requires.
**Connection to this task.** The `%` operator returns a division remainder. Therefore `n % k` is useful for divisibility checks and for working with the last digits of a number. The expression `'YES'` shows how this idea is applied to the task data.
For this task, pay special attention to `int(input())`: it connects the concept above to the concrete computation or program action.
**Focus: “Divisible by 3”.** The same basic mechanism is used in a different context here, so understand the operation itself rather than memorizing a finished line of code.
NEED HELP?
Hints
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['Divisibility means remainder 0.']
ANSWER
Solution
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n = int(input())
if n % 3 == 0:
print('YES')
else:
print('NO')