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 (Clang 3.8.0) (judge verdict: Runtime Error)

#include <stdio.h>

typedef struct {
	int v;
	int v_count;
}B;
int main(){
	int a[100000];
	B b[100000];
	int b_end = 0;
	int n;
	scanf("%d", &n);
	int i = 0;
	int r_count = 0;
	for (i = 0; i < n; i++){
		scanf("%d", &a[i]);
	}
	qsort(a, a + n);
	int tmp = a[0];
	int j = 0;
	int k = 0;
	for (i = 0; i < n; i++){
		if (a[i] == tmp){
			j++;
		}
		else{
			if (j > tmp){
				r_count += j - tmp;
			}
			else if (j < tmp){
				r_count += j;
			}
			tmp = a[i];
			j = 1;
		}
	}
	printf("%d\n", r_count);
	return 0;
}