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 C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AtCoder.Abc
{
    //https://atcoder.jp/contests/abc141/tasks/abc141_a
    public class QuestionA
    {
        public static void Main(string[] args)
        {
			//var sw = new System.IO.StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
			//Console.SetOut(sw);

			//// 文字列の入力
			//string s = Console.ReadLine();

			//// 整数の入力
			//long n = long.Parse(Console.ReadLine());

			//// 文字列配列の入力
			//string[] inputStrArray = Console.ReadLine().Split(' ');

			//// 整数配列の入力
			//var inputLongArray = Console.ReadLine().Split(' ').Select(i => long.Parse(i)).ToArray();

			var data = Console.ReadLine().Split(' ').Select(i => long.Parse(i)).ToArray();

			long a = data[0];
			long b = data[1];

			var ans = Math.Ceiling((a + b) / 2.0);

            Console.WriteLine(ans.ToString());

            Console.Out.Flush();
        }
    }
}