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 (GCC 5.4.1) (judge verdict: Runtime Error)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main() {
	int a[999999999]={};
	int n,t,max=0, ans = 0;
	scanf("%d", &n);
	for (int i = 0; i < n; i++)
	{
		scanf("%d", &t);
      a[t]++;
      max=(max>t)?max:t;
	}
	for (int i = 0; i < max; i++)
	{
      if(a[i]<i){
        ans+=a[i];
      }
      else if(a[i]>i){
        ans+=a[i]-i;
      }
	}
	printf("%d",ans);
	return 0;
}