import sequtils

proc getchar_unlocked():char {. importc:"getchar_unlocked",header: "<stdio.h>" .}
proc scan(): int =
  while true:
    let k = getchar_unlocked()
    if k < '0': break
    result = 10 * result + k.ord - '0'.ord

template useStack() =
  type Stack*[T] = ref object
    data: seq[T]
    size: int
    index: int
  proc newStack*[T](size: int = 64): Stack[T] =
    new(result)
    result.data = newSeq[T](size)
    result.size = size
    result.index = -1
  proc isEmpty*[T](self: Stack[T]): bool = self.index < 0
  proc isValid*[T](self: Stack[T]): bool = self.index >= 0 and self.index < self.size
  proc len*[T](self: Stack[T]): int =
    if self.isEmpty(): return 0
    return self.index + 1
  proc top*[T](self: Stack[T]): T =
    assert self.isValid()
    return self.data[self.index]
  proc pop*[T](self: var Stack[T]): T {.discardable.} =
    assert self.index >= 0
    result = self.top()
    self.index -= 1
  proc push*[T](self: var Stack[T], elem: T) =
    self.index += 1
    if self.index < self.size:
      self.data[self.index] = elem
    else:
      self.data.add(elem)
      self.size += 1

useStack()

let h = scan()
let w = scan()

var isWater : array[3001,array[3001,bool]]
for y in 0..<h:
  for x in 0..<w:
    isWater[x][y] = getchar_unlocked() == '1'
    discard getchar_unlocked()
const dxdy4 :seq[tuple[x,y:int]] = @[(0,1),(1,0),(0,-1),(-1,0)]
proc check(sx,sy:int) : bool =
  if not isWater[sx][sy]: return false
  var X = newStack[int]()
  var Y = newStack[int]()
  X.push(sx)
  Y.push(sy)
  while not X.isEmpty():
    let x = X.pop()
    let y = Y.pop()
    for d in dxdy4:
      let (nx,ny) = (x+d.x,y+d.y)
      if nx < 0 or nx >= w : continue
      if ny < 0 or ny >= h : continue
      if not isWater[nx][ny] : continue
      X.push(nx)
      Y.push(ny)
      isWater[nx][ny] = false
  return true
var ans = 0
for x in 0..<w:
  for y in 0..<h:
    if check(x,y) : ans += 1
echo ans