process.stdin.resume();
process.stdin.setEncoding('utf8');

process.stdin.on('data', function (chunk) {
var line = chunk.toString().split(' ');
var s = Number(line[0]);
var hour_sec = 60*60;
var minitu_sec = 60;

var h = Math.floor(s / hour_sec);
var m = Math.floor((s % hour_sec) / minitu_sec);
var sec = s % hour_sec %  minitu_sec;

console.log(h+':'+m+':'+sec);
    
});