a=float(input())
print("%d:%d:%f"%(int(a),int((a-int(a))*3600)//60 ,(a-int(a))*3600%60 ) )
>>>import datetime>>>
>>>now = datetime.datetime.now()
>>>nowtime = now.time()
>>>nowtime.hour * 3600 + nowtime.minute * 60 + nowtime.second
70320