How about 80 coins and 4 dolls?

That's great. In the doll machine game, the success rate of catching four dolls at a time is very low, which requires certain skills and luck. It takes 3-4 coins to catch a doll once, but it may not come out after 5-6 times. Sometimes 10 times may not come out, but you can catch four dolls with 80 coins, which shows that the player has performed very well in technology and luck.