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 JavaScript (node.js v5.12) (judge verdict: Accepted)

(function (input) {
  'use strict';
  const lines = input.split('\n')
  for(let i=0; i<lines.length;) {
    if (lines[i] == '1') {
      console.log('Hello World')
      i++
      continue
    }
    if (lines[i] == '2') {
      console.log(Number(lines[i+1]) + Number(lines[i+2]))
      i = i + 3
      continue
    }
    i++
  }
})(require("fs").readFileSync("/dev/stdin", 'utf8'));