process.stdin.resume();
process.stdin.setEncoding('utf8');
process.stdin.on('data',function(chunk){

var line = chunk.toString().split(' ');
var sec = Number(line[0]);
var hour_sec = 60*60
var minitue_sec = 60;


 var h = Math.floor(seconds / hour_sec);
  var m = Math.floor((seconds % hour_sec) / minute_sec);
  var s = seconds % hour_sec % minute_sec;
 
console.log(h+':'+m+':'+s);
});