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 <=10⁴