http://arc002.contest.atcoder.jp/tasks/arc002_1

arc002_1.js

process.stdin.resume();
process.stdin.setEncoding('utf8');
process.stdin.on('data', function (chunk) {
//console.time('1');
    var line = chunk.split('\n')[0].toString();
    var result = (function(year) {
    	var leap = false;
    	if (year % 4 === 0) leap = true;
    	if (year % 100 === 0) leap = false;
    	if (year % 400 === 0) leap = true;
    	return leap ? "YES" : "NO";
    }(parseInt(line,10)));

    console.log(result);

//console.timeEnd('1');
});