A video game gives a special bonus when the player collects a coin if the player collects the coin at the moment when the last digit of the milliseconds in the game's timer equals 1. Players don't see this timer, so
all 10 digits are equally likely, and there is a 1 in 10 chance that a player gets the bonus on any given coin
collected. Let C be the number of coins a player has to collect to first get the bonus. Assume that the last
digits are independent of each other.