h, w = gets.chomp.split(" ").map(&:to_i)
spot = []
arr = []
spot_count = 0
h.times do |i|
    a = gets.chomp.split(" ").map(&:to_i)
    arr << a
    a.each_with_index do |item,j|
        next if item == 0
        spot << [i,j]
        spot_count += 1
    end
end
island = Array.new(h).map{Array.new(w,false)}
count = 0
direction = [[0,-1],[0,1],[1,0],[-1,0]]
count = 0
#p spot
until spot == []
    i,j = spot.pop
    # puts "---------"
    # print "i" + "#{i}" + " " + "J" + "#{j}" + "\n"
    #p island
    tmp = [[i,j]]
    until tmp == []
        i,j = tmp.pop
    island[i][j] = true
        direction.each do |x,y|
            yy = i + y
            xx = j + x
            next if (xx < 0 || xx > w-1) || (yy < 0 || yy > h-1)
            #print "xx"+"#{yy}" + " " + "yy"+"#{xx}" + "\n"
            next if arr[yy][xx] == 0
            next if island[yy][xx] == true
            island[yy][xx] = true
            tmp << [yy,xx]
            count += 1
        end
    end
    #p spot
end
# p spot_count
# p count
puts spot_count - count