SUM To Certain Number - IF Statement Result Using Less Or Greater Than

Is there a way to tell Excel to sum only up to a certain point? Like if A1 through AF equal 50, but I only want it to sum up to 40, to stop at 40?

Is there also a way to tell Excel using IF that if a statement evaluating a number is true or false, to return the value up until a certain number. For instance, if the value is 8 or less, then it should return that number, but if it exceeds beyond 8, say for instance 12, then if the value is 12, only return 8.