import kotlin.collections.*
import kotlin.math.*

fun main() {
    val (n, x) = readLine()!!.split(" ").map { it.toInt() }
    val c = readLine()!!.split(" ").map { it.toInt() }

    if (x in c.min()!! .. c.max()!!) {
        println("Yes")
    } else {
        println("No")
    }
}