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

fun PrintWriter.solve() {
    val n = nextLong()
    var fac = 1L
    val lim = 1000000000000
    var over = false
    for (i in 1..n) {
        fac *= i
        if (fac >= lim) over = true
        fac %= lim
        if (fac == 0L) break
    }
    if (!over) {
        println(fac)
    } else {
        println("%012d".format(fac))
    }
}

fun main() {
    val writer = PrintWriter(System.out, false)
    writer.solve()
    writer.flush()
}

// 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