//
// factorial functions for Int, Long, and BigInt
//
def factorial(n : Int) : Int = {
  if (n > 1)
    n * factorial(n-1)
  else
    1
}
def factorial2(n : Long) : Long = {
  if (n > 1)
    n * factorial2(n-1)
  else
    1
}
def factorial3(n : BigInt) : BigInt = {
  if (n > 1)
    n * factorial3(n-1)
  else
    1
}
// example uses 
// print(factorial3(10))
// print(factorial3(30000))