Find the maximum value in a list of integers.

Examples:

Input: numbers = [1, 5, 3, 9, 2] Output: 9 Explanation: The largest number in the list is 9. Input: numbers = [-1, -5, -2] Output: -1 Explanation: The largest number among negative values is -1. Input: numbers = [42] Output: 42 Explanation: When there is only one number, that number is the maximum.
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