How to write if else statement with a value with multiple value set?

So for my 'f' value, it has from 1-15. How do I write my if-else statement if I want if f value == 1,6,7,8,9,10,12 it does something if-else f value == 2,3,4,5,13,14,15 do something else?

 if(a == "BLK A ", d == "BLK D ", e == "5", f == "1 "){
        // do something
    } 
    else if (f =="6"){
        // do something
    }