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)

use std::io;
use std::str::*;

fn main() {
    let mut line = String::new();
    io::stdin().read_line(&mut line).unwrap();
    let mut line = line.split_whitespace().map(i32::from_str);
    let (a, b) = (line.next().unwrap().unwrap(), line.next().unwrap().unwrap());
    println!("{}", ((a + b) as f64 / 2.0 + 0.1).round());
}