백준 10872번 with Kotlin 팩토리얼 #재귀

fun main(){
    val num = readLine()!!.toInt()
    val ans = factorial(num)
    print(ans)
}
fun factorial(n : Int): Int {
    var n = n
    if(n==0 || n==1)
        return 1
 
    return n*factorial(n-1)
}