Unexpected input within an if/elif statement

[fier259]

While trying to implement a simple if/elif statement, I'm getting an assault of errors that I don't understand. Hopefully, you will read my code and tell me what I'm doing wrong, I think I'm missing something basic. I have a function called "Stats" that displays the user's stats. By choosing an advantage that user can upgrade one of the three stats (health, power, luck).

if advantage == 1:
    BaseHealth = 150
Stats()

elif advantage = 2:
BaseLuck = 150
Stats()

elif advantage == 3:
BasePower = 150
Stats()

Thanks for your time