from PIL import Image

img = Image.open("nutsandbolts.jpg").convert("L")
pix = img.load()
width,height = img.size

t = 180 # This is a guess

used = []

def floodfill(x,y):
    area = [(x,y)]
    frontier = [(x,y)]
    while len(frontier) > 0:
        neighbors = [(x+1, y), (x-1, y), (x, y-1), (x, y+1)]
        for n in neighbors:
            if n[0] < 0 or n[1] < 0 or n[0] >= width or n[1] >= height:
                continue
            if pix[n[0], n[1]] < t and not n in area:
                frontier.append(n)
                area.append(n)
        x,y = frontier.pop()
        print len(frontier)
    used.extend(area)
    return area

bolts = 0
for i in range(width):
    for j in range(height):
        area = floodfill(i,j)
        if len(area) > 5:
            top = height
            bottom = 0
            left = width
            right = 0
            for p in area:
                x,y = p
                if x < top: top = x
                if x > bottom: bottom = x
                if y < left: left = x
                if y > right: right = x
            if pix[(top + bottom) / 2, (left + right) / 2] < t:
                bolts += 1

print bolts