You play a game using a standard six-sided die. You start with 0 points. Before every roll, you decide whether you want to continue the game or end...

You play a game using a standard six-sided die. You start with 0 points. Before every roll, you decide whether you want to continue the game or end it and keep your points. After each roll, if you rolled 6, then you lose everything and the game ends. Otherwise, add the score from the die to your total points and continue/stop the game.

When should one stop playing this game? Obviously, one wants to maximize total score.