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

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


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