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++14 (GCC 5.4.1) (judge verdict: Accepted)

#include<iostream>
#include<iomanip>
#include<algorithm>
#include<cmath>
#include<vector>
#include<string>
#include<bitset>
#include<queue>
#include<set>
#include<map>
using namespace std;
 
#define FOR(i,a,b) for (int i=(a);i<(b);++i)
#define ROF(i,b,a) for (int i=(b);i>(a);--i)
#define REP(i,n) FOR(i,0,n)
#define PER(i,n) ROF(i,n-1,-1)
 
typedef int i32;
typedef long long int i64;
typedef unsigned long long int ui64;
typedef float f32;
typedef double f64;
typedef long double f128;
typedef pair<int,int> Pi;
 
constexpr int INF = 1e9 + 7;
constexpr int dx[4] = {1,0,-1,0}, dy[4] = {0,1,0,-1};
 
int main() {
    int N; cin>>N;
    if (N==1) {
        cout << "Hello World" <<endl;
        return 0;
    }
    int A,B; cin>>A>>B;
    cout<<A+B<<endl;
}