$N=<>;
@_=<>;
if($N=~$"){
	print$`+$',$",@_
}elsif(@_>=2){
	$x+=$_ for@_;
	print$x,$/
}elsif(@_){
	map$x+=$_,glob"@_";
	print$x,$/
}elsif($N=~/^\d+$/){
#	print+(Fizz)[$_%3].(Buzz)[$_%5]||$_,$/for 1..$N
#}else{
	print"Hello World!\n"
}else{
	exit-1
}