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Given a number **N**, the task is to find the largest prime factor of that number.

**Example 1:**

**Input:**
N = 5
**Output:**
5
**Explanation:**
5 has 1 prime factor
i.e 5 only.

**Example 2:**

**Input:**
N = 24
**Output:**
3
**Explanation:**
24 has 2 prime factors
3 and 2 in which 3 is
greater

**Your Task:**

You don't need to read input or print anything. Your task is to complete the function **largestPrimeFactor()** which takes an integer **N** as input parameters and returns an integer, largest prime factor of N.

**Expected Time Complexity:** O(sqrt(N))

**Expected Space Complexity:** O(1)

**Constraints:**

1 <= N <= 10^{5}

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Largest prime factor

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