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: Runtime Error)

#include<stdio.h>
#include<stdlib.h>
#include<math.h>
int main(void){
  int N,T,A,i,j,k;
  double temp=10000.0;
  j=0;
  int H[N];
  if(scanf("%d",&N)!=1){
    exit(1);
  }
  if(scanf("%d%d",&T,&A)!=2){
    exit(1);
  }
  for(i=0;i<N;i++){
    if(scanf("%d",&H[i])!=1){
    exit(1);
  }
  }
  for(j=0;j<N;j++){
    if(temp>abs(T-H[j]*0.006-A)){
        temp=abs(T-H[j]*0.006-A);
  k=j;
    }
  }
  printf("%d",k+1);
  return 0;
}