Well, n is the number of key I actually have, like I have 10 Grift keys, but the bot shows I have 13 Grift keys, and when the keys run out, bot just stop in front of the gate stone, just stand there and keep trying enter Grift. it is no way to enter because my keys run out, but the bot believe I still have 3 keys.....I have tried deleted bd, and reinstall, but it does not work. Help please