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 (GCC 5.4.1) (judge verdict: Accepted)

/*A駅とB駅を結ぶ鉄道があり、運賃はX円です。また、B駅とC駅を結ぶバスがあり、運賃はY円です。
joisinoお姉ちゃんは,A駅からB駅まで鉄道で移動し,B駅からC駅までバスで移動すると、
バスの運賃が半額になる特別券を手に入れました。この特別券を用いたとき、A駅から 
C駅まで移動するのにいくらかかるか求めてください。*/

#include <stdio.h>

int main(void){
  int trainfee,basfee,allfee;
  scanf("%d %d",&trainfee,&basfee);
  allfee = trainfee + basfee/2;
  printf("%d",allfee);
  return 0;
}