import java.util.Scanner

import scala.collection.Searching._
import scala.annotation.tailrec
import scala.collection.mutable
import scala.collection.immutable._
import scala.io.StdIn.readLine

class IUnionFind(val size: Int) {

  private case class Node(var parent: Option[Int], var treeSize: Int)

  private val nodes = Array.fill[Node](size)(new Node(None, 1))

  def union(t1: Int, t2: Int): IUnionFind = {
    if (t1 == t2) return this

    val root1 = root(t1)
    val root2 = root(t2)
    if (root1 == root2) return this

    val node1 = nodes(root1)
    val node2 = nodes(root2)

    if (node1.treeSize < node2.treeSize) {
      node1.parent = Some(t2)
      node2.treeSize += node1.treeSize
    } else {
      node2.parent = Some(t1)
      node1.treeSize += node2.treeSize
    }
    this
  }

  def connected(t1: Int, t2: Int): Boolean = t1 == t2 || root(t1) == root(t2)

  def root(t: Int): Int = nodes(t).parent match {
    case None => t
    case Some(p) => root(p)
  }
}

object Main {
  val m = (1 << 9) - 1

  def solve(sc: => Scanner): Unit = {
    val H, W = sc.nextInt
    var ui = new IUnionFind(H * W)
    val A = Array.fill[Array[Boolean]](H)(Array.fill[Boolean](W)(sc.nextInt == 1))
    for (i <- 0 until H) {
      for (j <- 0 until W) {
        if (i != H - 1) {
          if (A(i)(j) == A(i + 1)(j)) {
            ui = ui.union(i * W + j, (i + 1) * W + j)
          }
        }
        if (j != W - 1) {
          if (A(i)(j) == A(i)(j + 1)) {
            ui = ui.union(i * W + j, i * W + (j + 1))
          }
        }
      }
    }
    System.gc();
    println((0 until H).map(i => (0 until W).map(j => if (A(i)(j) == true && ui.root(i * W + j) == i * W + j) (1) else (0)).sum).sum)
  }

  def main(args: Array[String]): Unit = {
    val sc: Scanner = new Scanner(System.in)
    solve(sc)
  }
}