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)

def geti; gets.to_i end
def getis; gets.split.map &:to_i end
def getin n;  n.times.map{geti}  end
def getisn n; n.times.map{getis} end
YES = "YES"; NO = "NO"; Yes = "Yes"; No = "No";

a,b=getis
p (a+b+1)/2

__END__
n,a,b=getis
puts (1..n).select{|s| c=s.to_s.chars.map(&:to_i).reduce(:+); a<=c&&c<=b }.reduce(:+)

a,b,c,d=getis
puts %w(Balanced Left Right)[a+b<=>c+d]

puts (gets.sub(?\s,'').to_i**0.5)%1==0? "Yes" : "No"

a,b=getis
puts a*b%2==0? "Even" : "Odd"