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 Java7 (OpenJDK 1.7.0) (judge verdict: Wrong Answer)

import java.math.BigDecimal;
import java.util.Scanner;


public class Main {

	public static void main(String[] args) {

		// 入力
		Scanner sc = new Scanner(System.in);
		int inputA = sc.nextInt();
		int inputB = sc.nextInt();
		sc.close();
		
		BigDecimal bd = new BigDecimal((inputB + inputA) / 2);
		
		System.out.println(bd.setScale(0, BigDecimal.ROUND_UP));
	}
}