Problem:
Score : 100 points

Problem Statement

You are given two positive integers a and b.
Let x be the average of a and b.
Print x rounded up to the nearest integer.

Constraints

a and b are integers.

1 \leq a, b \leq 100

Input

Input is given from Standard Input in the following format:

a b

Output

Print x rounded up to the nearest integer.

Sample Input 1

1 3

Sample Output 1

2

The average of 1 and 3 is 2.0, and it will be rounded up to the nearest integer, 2.

Sample Input 2

7 4

Sample Output 2

6

The average of 7 and 4 is 5.5, and it will be rounded up to the nearest integer, 6.

Sample Input 3

5 5

Sample Output 3

5

Solution in Rust (1.15.1) (judge verdict: Accepted)

#[allow(unused_macros)]
macro_rules! i {
    ( $( $t:ty ),* ) => {{
        let mut s = String::new();
        std::io::stdin().read_line(&mut s).ok();
        let mut i = s.split_whitespace();
        ( $( i.next().unwrap().parse::<$t>().unwrap() ),* )
    }};
    ( $( $t:ty ),* ; $e:expr ) => {
        (0..$e).map(|_| i!( $( $t ),* )).collect::<Vec<_>>()
    };
}

fn main() {
    let (a, b) = i!(u32, u32);
    println!("{}", (a + b + 1) / 2);
}