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 Java8 (OpenJDK 1.8.0) (judge verdict: Runtime Error)

import java.util.Scanner;
import java.util.Arrays;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        long a[] = new long[N];
        int tmp;
        int ans = 0;
        for (int z = 0; N > z; z++) {
            a[z] = sc.nextInt();
        }
        Arrays.sort(a);
        if (N == 1 && a[0] > 1) {
            ans = 1;
        } else {
            for (int j = 0; N > j; j++) {
                if (j == 0 || a[j] != a[j - 1]) {
                    tmp = 0;
                    for (int i = j; N > i; i++) {
                        if (a[j] == a[i]) {
                            tmp++;
                        }
                    }
                    if (tmp > a[j]) {
                        ans += tmp - a[j];
                    } else if (tmp  < a[j]) {
                        ans += tmp;
                    }
                }
            }
        }
        System.out.println(ans);
    }
}