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;

class B{
	static void Main(){
		Console.ReadLine();
		int t=0,a=0;
		var t1 =Console.ReadLine().Split(' ').Select(x => int.Parse(x)).ToList();
		t=t1[0];
		a=t1[1];
		var h = Console.ReadLine().Split(' ').Select(x => int.Parse(x)).ToList();
		float mintemp=999999999;
		int minindex=1;
		for(int index=1;index <= h.Count();index++){
			int h1 = h[index-1]; 
			if(mintemp > Math.Abs(a-h1)){
					mintemp=Math.Abs(a-h1);
					minindex=index;
					}
		}
		Console.WriteLine(minindex);
	}

	static float GetTemp(int based,int height)
	{
		return based-height * 0.006f;
	}
}