gistfile1.txt

    var numbers = readLine.split(" ").map(_.toInt).toList.sorted
    numbers = numbers.distinct ++ (numbers diff numbers.distinct)
    
    def solve(acc: Int, list: List[Int]):Int = list match{
      case (h::Nil) => acc
      case (h::t) => if (h+1 == t.head) solve(acc,t) else solve(acc+1,h+1::t.slice(0,t.size-1))
    }
    
    println(solve(0,numbers))