IF function with multiple conditions....

Hello Excel users.

I’d like to use an If function but for multiple conditions

Example

If (month (a1) = ( 3 ; 6 ; 9 ; 12); value if true; value if not true).

The idea is to pick a precise value if the month is 3 , 6 , 9 , 12 and another value ( a kind of estimation) for the rest of the months.