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 C++ (GCC 9.2.1) (judge verdict: Accepted)

#include <bits/stdc++.h>
#define newl "\n"
using namespace std;
using lli = long long int;
using vvint = vector <vector <int>>;
const int mod = 1e9 + 7;

const int N = 2e5 + 1;

void solve(){
	int n;
	cin >> n;
	if(n == 1){
		cout << "Hello World" << newl;
	}
	else{
		int a,b;
		cin >> a >> b;
		cout << a + b << newl;
	}

	return;
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout << fixed << setprecision(10);
	#ifdef EXECUTE_LOCALLY
		   freopen("in.txt","r",stdin);
	#endif
	int t = 1;
	//cin >> t;
	while(t--) solve();
	#ifdef EXECUTE_LOCALLY
    	cout << setprecision(3) << "program time: " << (double)clock() / CLOCKS_PER_SEC << newl;
	#endif
	return 0;
}