func main()
	const m: int :: 30
	
	var x: int :: 10 ^ 9
	for(1, m)
		do cui@print("\{x}\n")
		do cui@flush()
		var r: int :: cui@inputInt()
		
		if(r = 1)
			do cui@print("\{x}\n")
			ret
		end if
		
		do x :/ 2
	end for
end func