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)

fn main() {
    let mut ab = String::new();
    std::io::stdin().read_line(& mut ab).unwrap();
    let ab: Vec<f32> = ab.trim().split_whitespace()
            .map(|x| x.parse().unwrap()).collect();
    
    let mean = (ab[0] + ab[1]) / 2.0;
    let ans = mean.ceil();
    println!("{}",ans);
}