fun readLong(): Long = readLine()!!.toLong()
fun max(a: Long, b: Long): Long = if (a>b) a else b
fun abs(a: Long): Long = if (a<0) -a else a
fun f(a: Long): Long = a/2L
fun g(a: Long): Long = 2L*f(a)+a
tailrec fun h(a: Long, b: Long, c: Long): Long =
    if (a > 0) h(f(a), b+f(a), max(c,g(a))) else abs(c-b)
fun main(args: Array<String>) {
    val n: Long = readLong()
    println(h(n,n,2L*n))
}