Problem:
Score : 100 points

Problem Statement

How many hours do we have until New Year at M o'clock (24-hour notation) on 30th, December?

Constraints

1≤M≤23

M is an integer.

Input

Input is given from Standard Input in the following format:

M

Output

If we have x hours until New Year at M o'clock on 30th, December, print x.

Sample Input 1

21

Sample Output 1

27

We have 27 hours until New Year at 21 o'clock on 30th, December.

Sample Input 2

12

Sample Output 2

36

Solution in Ruby (2.3.3) (judge verdict: Runtime Error)

#!ruby -rprime
n=gets.to_i
a=(1..1e4).select{|i|[i,(i+1)/2].all?(&:prime?)}
n.times{
  l,r=gets.split.map(&:to_i)
  n=a.index{|i|i>=l}
  m=a.index{|j|j>=r}
  p m-n
}