func main()
	var n: int :: cui@inputInt()
	var dx: int :: n / 2 + 1
	do cui@print("\{2 - n % 2} \{(n + 1) / 2}\n")
	do cui@flush()
	while(true)
		var k: int :: cui@inputInt()
		if(k = 0)
			ret
		end if
		var x: int :: cui@inputInt()
		do cui@print("\{k} \{x < dx ?(x + dx, x - dx)}\n")
		do cui@flush()
	end while
end func