func main()
	var n: int :: cui@inputInt()
	var s: int :: cui@inputInt()
	var k: int :: cui@inputInt()
	
	var diffMin: int :: 100
	var ans: int :: 100
	
	for i(0, n - 1)
		var a: int :: cui@inputInt()
		var diff: int :: (s - a).abs()
		if(diff < diffMin)
			do diffMin :: diff
			do ans :: i + 1
		end if
	end for
	
	if(diffMin <= k)
		do cui@print("\{ans}\n")
	else
		do cui@print("Unlucky!\n")
	end if
end func