func main()
	var n: int :: cui@input().toInt(&)
	var ans: int
	var s: []char :: #[2 * n]char
	for i(0, n - 1)
		if(i = n - 1)
			do s[i * 2] :: '1'
			do s[i * 2 + 1] :: '\n'
		else
			do s[i * 2] :: '3'
			do s[i * 2 + 1] :: ' '
		end if
	end for
	do cui@print(s)
end func