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 Julia (1.4.0) (judge verdict: Runtime Error)

ParseInt(x) = parse(Int,x)
ParseMap(x::Array{SubString{String},1}) = map(ParseInt,x)
function main()
  a,b = ParseMap(split(readline()))
  println((Int)((a + b + 1) / 2))
end
main()