Problem:
Score: 100 points

Problem Statement

There is a train going from Station A to Station B that costs X yen (the currency of Japan).

Also, there is a bus going from Station B to Station C that costs Y yen.

Joisino got a special ticket. With this ticket, she can take the bus for half the fare if she travels from Station A to Station B by train and then travels from Station B to Station C by bus.

How much does it cost to travel from Station A to Station C if she uses this ticket?

Constraints

1 \leq X,Y \leq 100

Y is an even number.

All values in input are integers.

Input

Input is given from Standard Input in the following format:

X Y

Output

If it costs x yen to travel from Station A to Station C, print x.

Sample Input 1

81 58

Sample Output 1

110

The train fare is 81 yen.

The train fare is 58 ⁄ 2=29 yen with the 50% discount.

Thus, it costs 110 yen to travel from Station A to Station C.

Sample Input 2

4 54

Sample Output 2

31

Solution in C# (Mono 4.6.2.0) (judge verdict: Runtime Error)

using System;
using System.Linq;

public class Hello
{
    public static void Main()
    {
        // Your code here!
        int N = int.Parse(Console.ReadLine());
        int[] a = Console.ReadLine().Split(' ').Select(x => int.Parse(x)).ToArray();
        int[] H = Console.ReadLine().Split(' ').Select(y => int.Parse(y)).ToArray();
        int T = a[0];
        int A = a[1];
        int ans = 1;
        int difMin = 1000000;
        
        for(int i = 0; i < N; i++)
        {
            //標高H[i]における平均気温tを求める
            int t = T - (int)(H[i] * 0.006);
            //tとAの差difを求める
            int dif = Math.Abs(t - A);
            
            if(dif < difMin)//もしdifが最小値より小さいならば
            {
                //最小値を更新
                difMin = dif;
                //その時の場所の番号を記録
                ans = i + 1;
            }
        }
        Console.WriteLine(ans);
    }
}