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?

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.

Constraints

• $1 \leq X,Y \leq 100$
• Y is an even number.
• All values in input are integers.

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

见题面 Input 部分

见题面 Output 部分