Relativistic action is negative or positive number?

Question

Possible Duplicate:
Why lagrangian is negative number?

In the special relativistic action for a massive point particle, $$\int_{t_i}^{t_f}\mathcal {L}dt,$$ where the Lagrangian $$\mathcal {L}=-E_o\gamma^{-1}$$ is a negative number then the action is a negative or positive number?

(in my research it was negative, the result was correct but minus sign make me to ask this question)

Answer 1

The value of action itself is of no meaning, you can always add something to it, if you do not like its sign.