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 Python (3.4.3) (judge verdict: Runtime Error)

N = int(input())
T,A = map(int,input().split())
h = list(map(int,input().split()))
#iは番号
ans = 0
base = T - 0.06*h[0]
for i,n in enumerate(h):
    if(i==0):
        pass
    tem = T - 0.006*n
    if(abs(tem - A)<abs(base - A)):
        base = tem
        ans = i+1
    else:
        ans = 1
print(ans)