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>

int main(void){
	int i,j;
	
	int n,m;
	scanf("%d %d",&n,&m);
	
	long a[m+1][3];
	for(i=1;i<=m;i++){
		scanf("%d%d",&a[i][1],&a[i][2]);
		a[i][3]=1;
	}

	for(i=2;i<=m;i++){
		for(j=1;j<i;j++){
			if(a[i][1]==a[j][1]){
				if(a[i][2]<a[j][2]){
					a[j][3]++;
				}else{
					a[i][3]++;
				}
			}
		}
	}
	
	for(i=1;i<=m;i++){
		printf("%06d%06d\n",a[i][1],a[i][3]);
	}
	
	return 0;
}