object Main {
  def main(args: Array[String]): Unit = {
    val s = new Main()
    s.solve()
    s.out.flush()
  }
}

class Main {
  import java.io._
  import java.util.StringTokenizer
  import java.util.Arrays.sort

  import scala.collection.mutable
  import math.{abs, max, min}
  import mutable.ArrayBuffer
  import scala.reflect.ClassTag

  val MOD = 1000000007
  val out = new PrintWriter(System.out)

  def solve(): Unit = {
    val N = ni()
    val A = na(N)
    val dp = Array.fill[Long](5, N + 1)(1e18.toLong)
    dp(0)(0) = 0

    // 01234
    // 02120 これの部分文字列がありえる状態って感じ
    REP(N) { i =>
      dp(0)(i + 1) = dp(0)(i) + A(i) //0 -> 0 全部取り除く必要がある

      // 1, 3の遷移のとき、0の場合は最低2必要ってのに注意。2のときは最低1必要
      dp(1)(i + 1) = reduceDimFlip(dp, i, 2)(min) + (if (A(i) == 0) 2 else A(i)%2) // 0, 1 -> 1 奇数の場合は１こ取り除く
      dp(2)(i + 1) = reduceDimFlip(dp, i, 3)(min) + (if (A(i) == 0) 1 else A(i)%2^1) // 0, 1, 2 -> 2 偶数の場合は１こ取り除く
      dp(3)(i + 1) = reduceDimFlip(dp, i, 4)(min) + (if (A(i) == 0) 2 else A(i)%2) // 0, 1, 2, 3 -> 3 奇数の場合は１こ取り除く
      dp(4)(i + 1) = reduceDimFlip(dp, i, 5)(min) + A(i)  //0, 1, 2, 3, 4 -> 4 全部取り除く必要がある
    }

    debugDimFlip(dp)

    val ans = dp.map(_(N)).min
    out.println(ans)
  }

  private val oj = System.getenv("ATCODER_DEBUG") == null

  def DEBUG(f: => Unit): Unit = {
    if (!oj){ f }
  }

  def debug(as: Array[Boolean]): Unit = DEBUG {
    debug(as.map(x => if(x) "1" else "0").mkString)
  }

  def debug(as: Array[Int]): Unit = DEBUG {
    debug(as.mkString(" "))
  }

  def debug(as: Array[Long]): Unit = DEBUG {
    debug(as.mkString(" "))
  }

  def debugDim(m: Array[Array[Long]]): Unit = DEBUG {
    REP(m.length) { i =>
      debug(m(i))
    }
  }

  def debugDimFlip(m: Array[Array[Long]]): Unit = DEBUG {
    REP(m(0).length) { j =>
      REP(m.length) { i =>
        System.err.print(m(i)(j))
        System.err.print(" ")
      }
      System.err.println()
    }
  }

  def debug(s: => String): Unit = DEBUG {
    System.err.println(s)
  }

  def debugL(num: => Long): Unit = DEBUG {
    System.err.println(num)
  }

  class InputReader(val stream: InputStream) {
    private val reader = new BufferedReader(new InputStreamReader(stream), 32768)
    private var tokenizer: StringTokenizer = _

    def next(): String = {
      while (tokenizer == null || !tokenizer.hasMoreTokens)
        tokenizer = new StringTokenizer(reader.readLine)
      tokenizer.nextToken
    }

    def nextInt(): Int = next().toInt
    def nextLong(): Long = next().toLong
    def nextChar(): Char = next().charAt(0)
  }
  val sc = new InputReader(System.in)
  def ni(): Int = sc.nextInt()
  def nl(): Long = sc.nextLong()
  def nc(): Char = sc.nextChar()
  def ns(): String = sc.next()
  def ns(n: Int): Array[Char] = ns().toCharArray
  def na(n: Int, offset: Int = 0): Array[Int] = map(n)(_ => ni() + offset)
  def na2(n: Int, offset: Int = 0): (Array[Int], Array[Int]) = {
    val A1, A2 = Array.ofDim[Int](n)
    REP(n) { i =>
      A1(i) = ni() + offset
      A2(i) = ni() + offset
    }
    (A1, A2)
  }
  def nm(n: Int, m: Int): Array[Array[Int]] = {
    val A = Array.ofDim[Int](n, m)
    REP(n) { i =>
      REP(m) { j =>
        A(i)(j) = ni()
      }
    }
    A
  }
  def nal(n: Int): Array[Long] = map(n)(_ => nl())
  def nm_c(n: Int, m: Int): Array[Array[Char]] = map(n) (_ => ns(m))
  def REP(n: Int, offset: Int = 0)(f: Int => Unit): Unit = {
    var i = offset
    val N = n + offset
    while(i < N) { f(i); i += 1 }
  }
  def REP_r(n: Int, offset: Int = 0)(f: Int => Unit): Unit = {
    var i = n - 1 + offset
    while(i >= offset) { f(i); i -= 1 }
  }
  def TO(from: Int, to: Int)(f: Int => Unit): Unit = {
    REP(to - from + 1, from) { i =>
      f(i)
    }
  }

  def map[@specialized A: ClassTag](n: Int, offset: Int = 0)(f: Int => A): Array[A] = {
    val res = Array.ofDim[A](n)
    REP(n)(i => res(i) = f(i + offset))
    res
  }


  def sumL(as: Array[Int]): Long = {
    var s = 0L
    REP(as.length)(i => s += as(i))
    s
  }

  def cumSum(as: Array[Int]) = {
    val cum = Array.ofDim[Long](as.length + 1)
    REP(as.length) { i =>
      cum(i + 1) = cum(i) + as(i)
    }
    cum
  }

  /**
    * ２次元配列(i, j)のjを固定してiでreduceする
    */
  def reduceDimFlip(as: Array[Array[Long]], j: Int, len: Int)(f: (Long, Long) => Long): Long = {
    var res = as(0)(j)
    REP(len - 1, 1) { i =>
      res = f(res, as(i)(j))
    }
    res
  }
}

Measured memory_bytes: 57904