import Foundation

let line:[Int] = readLine()!.split(separator: " ").map{Int($0)!}

var a:Int = 1
var x:[Int] = []
while true {
    let y:Int = a * Int(pow(2.0, Double(line[1])))
    if y > Int(pow(2.0, Double(line[0]))) {
        break;
    }
    x += [y]
    a += 1
}

print(x.count)