What year is that? or it's just you recently bought it? I doubt that you bought it recently but if you will answer that you bought it recently then you've bought the wrong bitcoin.

400 BTC in quantity, man that's a lot if that's for real. I wouldn't tell to anyone even in the forum that I've bought and own that much. But if somebody asks you to provide proof that you really own it, are you going to provide proof?

$300 * 400 BTC = $120,000

$120,000 was your total investment.

If you still have it on this time with the current price of $34,000 * 400 BTC = $13,600,000. That's more than 100 times growth in your capital.