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-----
81 58

-----Sample Output-----
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.

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