Problem:
Score : 100 points

Problem Statement

Dolphin loves programming contests. Today, he will take part in a contest in AtCoder.

In this country, 24-hour clock is used. For example, 9:00 p.m. is referred to as "21 o'clock".

The current time is A o'clock, and a contest will begin in exactly B hours.
When will the contest begin? Answer in 24-hour time.

Constraints

0 \leq A,B \leq 23

A and B are integers.

Input

The input is given from Standard Input in the following format:

A B

Output

Print the hour of the starting time of the contest in 24-hour time.

Sample Input 1

9 12

Sample Output 1

21

In this input, the current time is 9 o'clock, and 12 hours later it will be 21 o'clock in 24-hour time.

Sample Input 2

19 0

Sample Output 2

19

The contest has just started.

Sample Input 3

23 2

Sample Output 3

1

The contest will begin at 1 o'clock the next day.

Solution in Ruby (2.3.3) (judge verdict: Wrong Answer)

# イルカはプログラミングコンテスト好きで、
# 今日はAtCoderのコンテストに参加します。
# 現在時刻は、24 時間表記 (0:00〜23:59) で
# A 時ちょうどであり、コンテストがちょうど B 時間後に始まります。
# コンテストの開始時刻は、24 時間表記で何時ちょうどでしょうか?

ab = gets.chomp.split
a = ab[0].to_i
b = ab[1].to_i

if a + b >= 24
    puts a + b - 21
else
    puts a + b
end