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: Wrong Answer)

#include<stdio.h>
int main(void){
    int a,b;
    double x;

    scanf("%d %d",&a,&b);
    x=(a+b)/2;
    if(a+b>=0){
        if(x-(int)x>=0.5){
            x=(int)x+1;
        }
        else{
            x=x;
        }
    }
    else{
        if(x-(int)x>=-0.5){
            x=(int)x-1;
        }
        else{
            x=x;
        }
    }
    
    printf("%.0f\n",x);
    return 0;
}