Problem:
﻿Score: 100 points

Problem Statement

In 2020, AtCoder Inc. with an annual sales of more than one billion yen (the currency of Japan) has started a business in programming education.

One day, there was an exam where a one-year-old child must write a program that prints Hello World, and a two-year-old child must write a program that receives integers A, B and prints A+B.

Takahashi, who is taking this exam, suddenly forgets his age.

He decides to write a program that first receives his age N (1 or 2) as input, then prints Hello World if N=1, and additionally receives integers A, B and prints A+B if N=2.

Write this program for him.

Constraints

N is 1 or 2.

A is an integer between 1 and 9 (inclusive).

B is an integer between 1 and 9 (inclusive).

Input

Input is given from Standard Input in one of the following formats:

1

2
A
B

Output

If N=1, print Hello World; if N=2, print A+B.

Sample Input 1

1

Sample Output 1

Hello World

As N=1, Takahashi is one year old. Thus, we should print Hello World.

Sample Input 2

2
3
5

Sample Output 2

8

As N=2, Takahashi is two years old. Thus, we should print A+B, which is 8 since A=3 and B=5.

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

N = gets.to_i
xs, ys, hs = [], [], []
N.times do |i|
    xs[i], ys[i], hs[i] = gets.split.map(&:to_i)
end
 
(0..100).each do |x|
    (0..100).each do |y|
        h = nil
        hmax = 10**10
        success = true
        N.times do |i|
            dist = (xs[i]-x).abs + (ys[i]-y).abs
            if hs[i] == 0
                hmax = dist if hmax > dist
            else
                hc = hs[i] + dist
                if h && h != hc
                    success = false
                    break
                else
                    h = hc
                end
            end
        end
        if success && h <= hmax
            puts [x, y, h].join(' ')
            exit
        end
    end
end
#from https://note.mu/vain0x/n/ndcec1623a167