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 Rust (1.15.1) (judge verdict: Accepted)

fn main() {
    /* 標準入力を開いて */
    let scan = std::io::stdin();

    let mut line = String::new();

    /* 読み込んで  */
    let _ = scan.read_line(&mut line);
    /* 空白で分割してからベクタにまとめる */
    let vec: Vec<&str> = line.split_whitespace().collect();

    /* それぞれを変換 */
    let n: u32 = vec[0].parse().unwrap_or(0);
    let m: u32 = vec[1].parse().unwrap_or(0);
    println!("{}", n+m/2);
}