class No697:
    height, width = 0, 0
    cnt = 0

    def __init__(self):
        self.height, self.width = map(int, input().split(" "))
        self.water_map = [[0 for i in range(self.width)] for j in range(self.height)]
        for i in range(self.height):
            self.water_map[i] = list(map(int, input().split(" ")))

    def solve(self):
        pos_y, pos_x = self.search_water()
        while not pos_y == -1 and not pos_x == -1:
            search_queue = [(pos_x, pos_y)]
            while len(search_queue) != 0:
                px, py = search_queue.pop()
                if self.water_map[py][px] == 1:
                    search_dic = [(0, 1, 0, -1), (1, 0, -1, 0)]
                    for i in range(4):
                        if 0 <= px + search_dic[0][i] < self.width and 0 <= py + search_dic[1][i] < self.height:
                            if self.water_map[py + search_dic[1][i]][px + search_dic[0][i]] == 1:
                                search_queue.append((px + search_dic[0][i], py + search_dic[1][i]))
                    self.water_map[py][px] = 0
            self.cnt += 1
            pos_y, pos_x = self.search_water()
        return self.cnt

    def search_water(self):
        for i in range(self.height):
            for j in range(self.width):
                if self.water_map[i][j] == 1:
                    return i, j
        return -1, -1


if __name__ == "__main__":
    que = No697()
    ans = que.solve()
    print(ans)