# Problem B

Count Doubles

Given an array of $n$ positive integers and an integer $m$, count how many contiguous subarrays of exactly $m$ elements have two or more even values.

For example, given the subarray `1 2 3 4 5 6 7 8` and
$m = 3$, the three
subarrays `2 3 4`, `4 5 6`, and `6 7 8`
each have at least two even values.

## Input

The first line of input consists of the size $1\leq n\leq 10^3$ of the array, followed by $m<n$, the subarray size. Then $n$ positive integers, each at most $10^3$, follow on the second line.

## Output

Output how many contiguous subarrays of $m$ elements have at least two even elements.

Sample Input 1 | Sample Output 1 |
---|---|

8 3 1 2 3 4 5 6 7 8 |
3 |

Sample Input 2 | Sample Output 2 |
---|---|

9 4 1 2 3 5 7 8 9 11 5 |
0 |