Problem:
Score: 100 points

Problem Statement

There is a train going from Station A to Station B that costs X yen (the currency of Japan).

Also, there is a bus going from Station B to Station C that costs Y yen.

Joisino got a special ticket. With this ticket, she can take the bus for half the fare if she travels from Station A to Station B by train and then travels from Station B to Station C by bus.

How much does it cost to travel from Station A to Station C if she uses this ticket?

Constraints

1 \leq X,Y \leq 100

Y is an even number.

All values in input are integers.

Input

Input is given from Standard Input in the following format:

X Y

Output

If it costs x yen to travel from Station A to Station C, print x.

Sample Input 1

81 58

Sample Output 1

110

The train fare is 81 yen.

The train fare is 58 ⁄ 2=29 yen with the 50% discount.

Thus, it costs 110 yen to travel from Station A to Station C.

Sample Input 2

4 54

Sample Output 2

31

Solution in C (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <stdio.h>
#include <string.h>
#include <math.h>

int main() {
  int N,T,A;
  scanf("%d", &N);
  scanf("%d %d",&T,&A);
  int H[1100];
  int i;

  for (i = 0; i < N; i++) {
    scanf("%d", &H[i]);
  }

  //地点iの平均気温
  double temp[110];
  for (i = 0; i < N; i++) {
    temp[i] = T - H[i] * 0.006;
  }

  //地点iの平均気温とAの差
  double sa[1100];
  for (i = 0; i < N; i++) {
    sa[i] = A - temp[i];
    if (sa[i] < 0) {
      sa[i] = -sa[i];
    }
  }

  double min = sa[0];
  int k = 0;

  //sa[i]が最小となるようなiを求める。
  for (i = 0; i < N; i++) {
    if (sa[i] < min) {
      min = sa[i];
      k = i;
    }
  }

  printf("%d\n", k);

}