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: Accepted)

using System;
using System.Text;
using System.Collections.Generic;
using System.Linq;
 
class Program {
    static List<long> rep;
    static void Main(string[] args){
        //入力を受け取る
       
        var AB  = Console.ReadLine().Split().Select(a => long.Parse(a)).ToArray();
        var A = AB[0];
        var B = AB[1];
        long ans = A+B/2;
        
        
       　Console.WriteLine(ans);
        
        
    }
    
    static int LowerBound(long num){
        
        var l = 0;
        var r = rep.Count()-1;
      
        while(l <= r){
            
            var mid = l+(r-l)/2;
            if(rep[mid] < num){
                l = mid+1;
            }else{
               
                r = mid-1;
            }
        }
        return l;
    }     
}