import math, sequtils, strutils, times

let
  a = parseInt readLine stdin
  m = int round a / 100 * 60
  t = initDuration(hours = 10, minutes = m)
  hr = t.toParts[Hours]
  min = t.toParts[Minutes]

echo [$hr, $min].mapIt(it.align(2, '0')).join ":"