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 582=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