Problem:
Score : 100 points

Problem Statement

You are given two positive integers a and b.
Let x be the average of a and b.
Print x rounded up to the nearest integer.

Constraints

a and b are integers.

1 \leq a, b \leq 100

Input

Input is given from Standard Input in the following format:

a b

Output

Print x rounded up to the nearest integer.

Sample Input 1

1 3

Sample Output 1

2

The average of 1 and 3 is 2.0, and it will be rounded up to the nearest integer, 2.

Sample Input 2

7 4

Sample Output 2

6

The average of 7 and 4 is 5.5, and it will be rounded up to the nearest integer, 6.

Sample Input 3

5 5

Sample Output 3

5

Solution in PHP (5.6.30) (judge verdict: Accepted)

<?php /*test.php*/

$t = new temp();

$t->stdin(fgets(STDIN));
$t->run();

unset($t);

class temp{
	private $stdin = array();
	
	public function __construct(){
	}

	public function stdin($data = null){
		$this->stdin = explode(" ", $data);
	}

	public function run(){
		$num = ($this->stdin[0] + $this->stdin[1]) / 2;
		$num = ceil($num);
		echo $num;
	}
	
}

?>