Number of even elements in a two-dimensional array

A two-dimensional array of size $n\cdot m$ is given. Find the number of even elements in it.

Input

The first line contains two numbers $n$ and $m$ — the number of rows and the number of columns, respectively. Then given $n$ lines with $m$ numbers — the elements of the array.

Output

Print the number of even elements in the array.

Examples