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Practice Smallest Even Multiple

Read the task, work through the examples, and check your approach against the constraints. Use the original LeetCode task for coding and submissions.

Easy#2413
LeetCode Problem

Smallest Even Multiple

MathNumber Theory

Problem Statement

Return the smallest positive integer divisible by both n and 2, where n is positive. The result must be a multiple of n as well as even. Practice approach: If n is already even, n itself works. If n is odd, its next multiple, 2 * n, is the first even one. This is the least common multiple of n and 2 without a general-purpose GCD calculation. Time and extra space are O(1). Test n = 1, an even value, and an odd value.

Source: Smallest Even Multiple on LeetCode. Use the original task for its coding environment and submissions.

Examples

# Example 1

Input
n = 5
Output
10

# Example 2

Input
n = 6
Output
6

Constraints

1 <= n <= 150

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