/**

* Created by youngsug on 5/16/2016.

*/

function primes(x)

{

var totalnum=[];

if(x<2) return totalnum;

if(x>=2){

totalnum.push(2);

}

var isPrime = function(n){

if(n<2) return false;

for(var i=0;i<totalnum.length; i++){

if( n % totalnum[i] === 0 ) return false;

}

return true;

};

for(var k=3;k<=x ; k=k+2){

if(isPrime(k)) totalnum.push(k);

}

return totalnum;

}

var primeArr = primes(100);

console.log(primeArr, primeArr.length);

console.log ( 'type number : ');

process.stdin.resume();

process.stdin.setEncoding("ascii");

process.stdin.on("data", function (input) {

var primeArr = primes(input);

console.log(primeArr.length, ' : ', primeArr.toString() );

});