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 C++14 (Clang 3.8.0) (judge verdict: Accepted)

#include <iostream>

int main(void)
{
    int a, b;
    std::cin >> a >> b;
    int c = (a + b) / 2;
    if (((a + b) & 1) == 1)
    {
        c += 1;
    }
    std::cout << c << std::endl;
    return 0;
}