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Given a number N. Find if it can be expressed as sum of two prime numbers.

**Example 1:**

**Input**: N = 34
**Output:** "Yes"
**Explanation**: 34 can be expressed as
sum of two prime numbers.

**Example 2:**

**Input: **N = 23
**Output: **"No"
**Explanation**: 23 cannnot be expressed as
sum of two prime numbers.

**Your Task: **

You dont need to read input or print anything. Complete the function **isSumOfTwo() **which takes N as input parameter and returns "Yes" if can be expressed as sum of two prime numbers. else return "No".

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

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

**Constraints:**

1<= N <=10^{4}

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Yes
Primes sum

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