Given an array of integers `nums` of length `n`. Find an integer `P` such that there are exactly `P` elements in array that are greater than `P` and `P` need not be an element from array.\n\n**Example:**\n```\nInput: [1, 3, 4]\nOutput: 2\nExplanation: There are exactly 2 elements in array that are greater than two and 2 is not present in the array.\n```

Given an array of integers nums of length n. Find an integer P such that there are exactly P elements in array that are greater than P and P need not be an elem