bits

#!/usr/bin/python

def read_file(path):
    with open(path, 'rb') as f:
        return f.read()

rawgrid = (' '.join(format(ord(x), '08b') for x in read_file("map.dat"))).replace(" ","")

grid = [[False for x in range(4802)] for x in range(4802)]

for i in range(0,4800):
    for j in range(0,4800):
        if rawgrid[i*4800+j] == '0':
            grid[i+1][j+1] = True

count = 0
queue = [(1,1)]
while len(queue) != 0:
    nqueue = []
    while len(queue) != 0:
        coord = queue.pop()

        x = coord[0]
        y = coord[1]

        if grid[x][y] == False:
            continue

        count += 1
        grid[x][y] = False

        if grid[x-1][y] == True:
            nqueue.append((x-1,y))
        if grid[x+1][y] == True:
            nqueue.append((x+1,y))
        if grid[x][y-1] == True:
            nqueue.append((x,y-1))
        if grid[x][y+1] == True:
            nqueue.append((x,y+1))
    queue = nqueue

print count