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 Ruby (2.3.3) (judge verdict: Accepted)

# Problem https://atcoder.jp/contests/abc082/tasks/abc082_a
a,b = gets.chomp('\n').split(' ').map(&:to_i)
average = (a+b)/2
aveMod2 = (a+b)%2
if aveMod2 == 1
    answer = average+1
else
    answer = average
end
puts(answer)