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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.*;
import java.io.*;

class Main
{
	public static void main( String[] args )
	{
		Main m = new Main();
		m.A();
	}

	void A()
	{
		Scanner in = new Scanner(System.in);
		int n = in.nextInt();
		if(n == 1) System.out.println("Hello World");
		if(n == 2)
		{
			int a = in.nextInt(), b = in.nextInt();
			System.out.println(a + b);
		}
	}

	// int numWays(int k)
	// {
	// 	if(k < 3) return 1;
		
	// }


	// static int B(String str)
	// {
	// 	int cur = Integer.valueOf(str);
	// 	for(int i = 111; i <= 999; i += 111)
	// 		if(cur <= i) return i;
	// 	return cur;	// should not execute this line
	// }

	// static String update(String str)
	// {
	// 	char[] ch = str.toCharArray();
	// 	for(int i = 0; i < 3; i++)
	// 	{
	// 		if(ch[i] == '1') ch[i] = '9';
	// 		else ch[i] = '1';
	// 	}
	// 	return String.valueOf(ch);
	// }

}