import scala.annotation.tailrec

object Main extends App {
    val ss = readInt
    val (hh, ss2) = f(3600, ss, 0)
    val (mm, ss3) = f(60, ss2, 0)
    println(f"$hh%d:$mm%d:$ss3%d")
    
    @tailrec
    def f (t: Int, r: Int, n: Int) : (Int, Int) = {
        if (r >= t) { f( t, (r - t), (n + 1) ) } else { (n, r) }
    }
}
