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<bits/stdc++.h>
using namespace std;

#define fi       first
#define se       second
#define pf       printf
#define mp       make_pair
#define pb       push_back
#define si(x)    scanf("%d", &x)
#define pi(x)    printf("%d\n", x)
#define sl(x)    scanf("%lld", &x)
#define pl(x)    printf("%lld\n", x)
#define all(x)   x.begin(), x.end()
#define READ(f)  freopen(f, "r", stdin)
#define WRITE(f) freopen(f, "w", stdout)

typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef map<ll, ll> mll;
typedef pair<ll, ll> pll;
typedef map<int, int> mii;
typedef pair<int, int> pii;
typedef map<char, int> mci;
typedef map<char, char> mcc;
typedef pair<char, int> pci;
typedef unsigned long long ull;

const ll MAX = 100005;
const ll MOD = 1000000007;
const ll INF = 1000000000000000;
const double PI = 2 * acos(0.0);
const double EPS = 0.00000000001;

int main() {
    int n, a, b;
    si(n);

    if (n == 1) puts("Hello World");
    else {
        si(a), si(b);
        pi(a + b);
    }

    return 0;
}