i=input;print(('2'>i()and'Hello World'or int(i())+int(i())))
n,*t=list(map(int,open(0)));print((n%2*'Hello World'or sum(t)))
i = input
print(("2" > i() and "Hello World" or int(i()) + int(i())))

n, *t = list(map(int, open(0)))
print((n % 2 * "Hello World" or sum(t)))

-i = input -print(("2" > i() and "Hello World" or int(i()) + int(i()))) +n, *t = list(map(int, open(0))) +print((n % 2 * "Hello World" or sum(t)))