Factorials or something more than basic arithmetic (+exponents) is needed as I went ahead and programmatically checked every expression without parenthesis and the closest would always be 195. Interestingly, all values within a difference of 10 were multiples of 3.
A lost cause indeed.
That was my initial thought, but you can do add or sub by 2 (6 / 3) to get a non-multiple of 3. I had to double check and see that there were in fact values of i.e. x.5 within I think a difference of 64, can’t remember the exact values or their expressions.