Krauss's Riddle: Hint

[prof]

Heheheheh. Do you give up?
I-I won't give up, kiiiii! So, you're saying that Murakoshi Publishing Co, Ltd. is on floor X?!
Not floor X. The _th floor.
It's the same either way, isn't it?



I've got it, Ange! Try saying them aloud, starting from the first floor...! THere's only one that fits!
Huh? Wh-What do you mean?