TASK

Problem

#82

Given `day` and `month` in a non-leap year, print `VALID` if the date exists, otherwise `INVALID`.

EXAMPLE

Example

Input

31 4

Output

INVALID

LIMITS

Constraints

1 ≤ month ≤ 12; 1 ≤ day ≤ 31

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LEARN Theory for this problem

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### Date Validation

`if / else if / else` chooses a branch from boolean conditions. Comparisons such as `<`, `>=`, `===` and logical operators `&&`, `||`, `!` combine the exact rules that decide which output is valid.

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NEED HELP? Hints

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['Translate every case from the statement into a boolean condition before writing branches.', 'Check the empty/invalid fallback explicitly instead of relying on `undefined` or `NaN`. For “Date Validation” in “Programming Basics”, verify that the exact output format matches the statement.']

✓

ANSWER Solution

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const fs = require('fs');

const [day, month] = fs.readFileSync(0, 'utf8').trim().split(/\s+/).map(Number);

let daysInMonth;

if (month === 2) {
    daysInMonth = 28;
} else if ([4, 6, 9, 11].includes(month)) {
    daysInMonth = 30;
} else {
    daysInMonth = 31;
}

console.log(day <= daysInMonth ? 'VALID' : 'INVALID');