import Foundation

let a = readLine()!
let b = readLine()!.components(separatedBy: " ")


var i = Int(b[0])!

var isCheck: Bool = false

if (Int(a)! == 1) {
  isCheck = true
}

while i < Int(b[1])! {
  if (i & Int(a)! == 0) {
    isCheck = true
  }
  i += 1 
  print(i)
}

isCheck ? print("OK") : print("NG")