import java.lang.Math

val MOD: Int = 1000000000 + 7
val MODL: Long = MOD.toLong()

fun main(args: Array<String>)
{
    val (k, x)  = read().split(" ").map{it.toInt()}
    println(if (500 * k >= x) "Yes" else "No")
}

fun read(): String = readLine()!!
