import java.util.Scanner
val scanner = Scanner(System.`in`)

fun main(){
    var n = scanner.nextInt()
    var k = scanner.nextInt()
    var x = 1.shl(k)
    var m = 1.shl(n)
    var cnt = 0
    if (k == 0){
        println(m)
    }
    else if (n < k){
        println(0)
    }
    else{
        println(1.shl(n-k))
    }
}