10519: ABC113 —— A - Discount Fare
[Creator : ]
Description
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?
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:
```
$X$ $Y$
```
```
$X$ $Y$
```
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.
- $Y$ is an even number.
- All values in input are integers.
Sample 1 Input
81 58
Sample 1 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.
Sample 2 Input
4 54
Sample 2 Output
31