using System;
using System.Collections.Generic;

class Program
{

    Program()
    {

        int[] A = getValues(Console.ReadLine());

        int H = A[0];
        int W = A[1];

        int[][] field = new int[H][];
        for (int i = 0; i < H; i++)
        {
            field[i] = getValues(Console.ReadLine());
        }

        int rake = 0;

        for (int i = 0; i < H; i++)
        {
            for (int j = 0; j < W; j++)
            {
                if (field[i][j] == 1)
                {
                    rake++;
                    check(field, i, j);
                }
            }
        }
        Console.WriteLine(rake);
    }

    void check(int[][] field, int sx, int sy)
    {
        Queue<Tuple<int, int>> queue = new Queue<Tuple<int, int>>();
        queue.Enqueue(new Tuple<int, int>(sx, sy));

        field[sx][sy] = 0;
        while (queue.Count > 0)
        {
            var P = queue.Dequeue();

            int x1 = P.Item1;
            int y1 = P.Item2;

            for (int i = -1; i <= 1; i++)
            {
                for (int j = -1; j <= 1; j++)
                {
                    if (Math.Abs(i + j) != 1)
                    {
                        continue;
                    }
                    int x = x1 + i;
                    int y = y1 + j;
                    if (0 <= x && x < field.Length && 0 <= y && y < field[0].Length && field[x][y] == 1)
                    {
                        field[x][y] = 0;
                        queue.Enqueue(new Tuple<int, int>(x, y));
                    }
                }
            }
        }
    }


    static int[] getValues(string s)
    {
        string[] A = s.Split();
        int[] B = new int[A.Length];
        for (int i = 0; i < A.Length; i++)
        {
            B[i] = int.Parse(A[i]);
        }
        return B;
    }

    static void Main(string[] args)
    {
        new Program();
    }
}