static void Main(string[] args)
{
StreamReader sr = new StreamReader("in.txt");
StreamWriter sw = new StreamWriter("out.txt");
var tmp = sr.ReadLine().Split(new[] { " " }, StringSplitOptions.RemoveEmptyEntries);
int sizeN = int.Parse(tmp[0]);
int sizeM = int.Parse(tmp[1]);
int[,] mtx = new int [sizeN + 2, sizeM + 2];
for (int i = 0; i < sizeM + 2; ++i)
{
mtx[0, i] = -1;
mtx[sizeN + 1, i] = -1;
}
for (int i = 0; i < sizeN + 2; ++i)
{
mtx[i, 0] = -1;
mtx[i, sizeM + 1] = -1;
}
for (int i = 0; i < sizeN; ++i)
{
var mtxLine = sr.ReadLine().Split(new[] { " " }, StringSplitOptions.RemoveEmptyEntries);
for (int j = 0; j < sizeM; ++j)
{
mtx[i + 1, j + 1] = int.Parse(mtxLine[j]);
}
}
CheesBoard board = new CheesBoard(mtx, sizeN, sizeM);
int result = Solver(board);
sw.WriteLine(result);
sr.Close();
sw.Close();
}
public static int Solver(CheesBoard board)
{
int result = 0;
for (int i = 0; i < board.getCountRow(); ++i)
{
for (int j = 0; j < board.getCountCol(); ++j)
{
if (board.getValue(i, j) != -1)
{
LinkedList <CellIndex> squares = new LinkedList <CellIndex>();
CellIndex square = new CellIndex(i, j);
squares.AddLast(square);
board.setValue(i, j, -1);
while (squares.Count != 0)
{
CellIndex sq = squares.Last();
squares.RemoveLast();
if (sq._x > 0)
{
if (board.getValue(sq._x - 1, sq._y) != -1)
{
board.setValue(sq._x - 1, sq._y, -1);
squares.AddLast(new CellIndex(sq._x - 1, sq._y));
}
}
if (sq._x < board.getCountRow() - 1)
{
if (board.getValue(sq._x + 1, sq._y) != -1)
{
board.setValue(sq._x + 1, sq._y, -1);
squares.AddLast(new CellIndex(sq._x + 1, sq._y));
}
}
if (sq._y > 0)
{
if (board.getValue(sq._x, sq._y - 1) != -1)
{
board.setValue(sq._x, sq._y - 1, -1);
squares.AddLast(new CellIndex(sq._x, sq._y - 1));
}
}
if (sq._y < board.getCountCol() - 1)
{
if (board.getValue(sq._x, sq._y + 1) != -1)
{
board.setValue(sq._x, sq._y + 1, -1);
squares.AddLast(new CellIndex(sq._x, sq._y + 1));
}
}
}
result++;
}
}
}
return(result);
}