You are given an array **arr** of size N and you are provided with a number K. You have to pick K consecutive elements from the array **arr**, check if their sum is even, and make a count on every even sum. If K consecutive elements have an even sum, then print the count of even sums, otherwise print -1.

**Input Format:**

The input consists of three lines:

- The first line contains an integer N denoting the size of the array.
- The second line contains N space-separated integers denoting the elements of the array arr .
- The third line contains an integer K.

The input will be read from the STDIN by the candidate

**Output Format:**

if K consecutive elements have an even sum then print the count of even sums, otherwise print -1. The output will be matched to the candidate's output printed on the STDOUT

**Example:**

**Input:**

5

2 4 6 8 10

2

**Output:**

4

**Explanation:**

Since K=2, pairs having even sum are (2,4), (4,6), (6,8), and (8,10). Hence, the answer is 4.

**C++ Code:-**

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