fun judge(N: Int): Boolean {
    val zero = "".length
    val one = "a".length
    val two = "aa".length

    if (N == one) {
        return false
    }
    for (i in two until N) {
        if (N % i == zero) {
            return false
        }
    }
    return true
}

fun main(args: Array<String>) {
    val N = readLine()!!.toInt()
    println(if (judge(N)) "YES" else "NO")
}