import java.io.PrintWriter
import java.util.*
import kotlin.math.*

fun PrintWriter.solve() {
    val size = 100000
    val isPrime = BooleanArray(size) { true }
    val primes = mutableListOf<Int>()
    for (p in 2 until size) {
        if (!isPrime[p]) continue
        primes.add(p)
        var n = p * 2
        while (n < size) {
            isPrime[n] = false
            n += p
        }
    }
    val m = nextInt()
    if (m == 0) {
        println(1)
        println(1)
        return
    }
    val s = m.toString(2).padStart(30, '0')
    var ind = 30
    val ans = mutableListOf<Int>()
    for (i in 29 downTo 0) {
        if (s[i] == '1') {
            repeat(30 - i) {
                ans.add(primes[i] * primes[ind])
                ind++
            }
        }
    }
    println(ans.size)
    println(ans.joinToString(" "))
}

fun main() {
    Thread(null, {
        val writer = PrintWriter(System.out, false)
        writer.solve()
        writer.flush()
    }, "solve", abs(1L.shl(26)))
        .apply { setUncaughtExceptionHandler { _, e -> e.printStackTrace(); kotlin.system.exitProcess(1) } }
        .apply { start() }.join()
}

// region Scanner
private var st = StringTokenizer("")
private val br = System.`in`.bufferedReader()

fun next(): String {
    while (!st.hasMoreTokens()) st = StringTokenizer(br.readLine())
    return st.nextToken()
}

fun nextInt() = next().toInt()
fun nextLong() = next().toLong()
fun nextLine() = br.readLine()
fun nextDouble() = next().toDouble()
// endregion