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Given a number n, find the total numbers, less than or equal to n which have at-least one common factor with n other than 1.

**Example 1:**

**Input: **n = 6
**Output: **4
**Explanation: **For n=6, the 4 numbers having
a common factor between them and 6
are : 2, 3, 4 & 6

**Example 2:**

**Input: **n = 15
**Output: **7
**Explanation: **For N=15, the 7 numbers having a
common factor between them and 15
are : 3, 5, 6, 9, 10, 12, 15

**Your Task:**

You don't need to read or print anything. Your task is to complete the function **CommonFactor() **which takes n as input parameter and returns total numbers. less than or equal to n which have atleast one common factor with n other than 1.

**Expected Time Complexity: **O(nlog(n))

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

**Constraints:**

1 <= n <= 10^{5}

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Mathematical manipulation

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