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)

# 12月30日の時間
Day1230 = 24

# 12月31日の時間
Day1231 = 24

# 受け取る値
get = gets.to_i

# 12月30日の残り時間を計算
Day1230 = Day1230 - get

put Day1231 + Day1230