A sequence of numbers is entered. Count the number of even numbers in even places.
Input
First enter the number N, and then N numbers - members of the sequence.
Output
Print the number of even numbers in even places in the sequence.
Examples
| # |
Input |
Output |
| 1 |
5
1 2 4 5 6
|
1 |
Explanation: the only even number in an even place in the sequence is the number 2. The numbers 4 and 6 are not suitable, because they are in the 3rd and 5th places, respectively.