import java.io.BufferedReader
import java.io.InputStream
import java.io.InputStreamReader
import java.io.PrintWriter
import java.lang.StringBuilder
import java.util.*

fun PrintWriter.solve(sc: FastScanner) {
    val n = sc.nextInt()
    val lst = mutableListOf(1L)
    val isprime = Array(200000) { true }
    for (i in 2 until 200000) {
        if (isprime[i]) {
            var j = 2
            while (i * j < 200000) {
                isprime[i * j] = false
                j++
            }
        }
    }
    val primes = mutableListOf<Long>()
    for (i in 100000 until 200000) {
        if (isprime[i]) {
            primes.add(i.toLong())
            if (primes.count() > 10) break
        }
    }
    for (i in primes) {
        for (j in primes) {
            val v = i * j
            if (!lst.contains(v)) {
                lst.add(v)
            }
        }
    }
    lst.sort()
    println(lst[n - 1])
}

fun main(args: Array<String>) {
    val writer = PrintWriter(System.out, false)
    writer.solve(FastScanner(System.`in`))
    writer.flush()
}

class FastScanner(s: InputStream) {
    private var st = StringTokenizer("")
    private val br = BufferedReader(InputStreamReader(s))

    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()
    fun ready() = br.ready()
}