There are 100 stones, Ashley and Bob are playing a game. Each turn they take stones from the pile. The last one who take the stones wins the game.
First turn goes to Ashley, she takes 3 stone. Then Bob takes 2 stones. If the next turn Ashley takes 1 stone, how many stones should Bob takes to win the game?
Note : each turn they must take 1, 2, or 3 stones and cannot pass.