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Given a positive integer **K**. Find the number of ordered pairs of positive integers (**a**,**b**) where **1**≤**a**<**b**<**K** such that **a**+**b** ≤ **K**.

**Example 1:**

Input:K =2Output:0Explanation:There are no solutions for K = 2.

**Example 2:**

Input:K =4Output:2Explanation:There are 2 solutions:- (1,2) and (1,3).

**Your Task:**

You don't need to read input or print anything. Your task is to complete the function **numOfWays()** which takes an Integer K as input and returns the number of solutions for a and b (1≤a<b<K) such that a+b ≤ K.

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

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

**Constraints:**

1 <= K <= 10^{5}

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Number of ways to find two numbers

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