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 Python (3.4.3) (judge verdict: Runtime Error)

n = int(input())
xy = [[i, j] for i in range(101) for j in range(101)]

def md(x1, x2):
  return abs(x1[0]-x2[0]) + abs(x1[1]-x2[1])
        
infos = []
for i in range(n):
  info = list(map(int, input().split()))
  infos.append(info)
  
  if i != 0:
    for j in range(i):
      if infos[j][0] != 0:
        dh = infos[i][2] - infos[j][2]
        xy = list(filter(lambda x: md(x, infos[j][:2]) - md(x, infos[i][:2]) == dh, xy))
      
  if len(xy) == 1:    
    break

    
x = xy[0][0]
y = xy[0][1]
k = 0
for i in range(n):
  if infos[i][2] > 0:
    k = i
    break
h = md(infos[k][:2], [x, y]) + infos[k][2]
print('{} {} {}'.format(x, y, h))