source = (500,0)

data = []
xs = []
ys = []
for line in open("input"):
    path = []
    for point in line.replace("->", " ").split():
        x, y = map(int, point.split(","))
        path.append((x,y))
        xs.append(x)
        ys.append(y)
    data.append(path)


grid = []
sand = {}

X0 = min(xs)
X1 = max(xs) + 1
Y0 = 0
Y1 = max(ys) + 1

# part 2:
X0 -= 1000
X1 += 1000
Y1 += 1

DX = X1 - X0
DY = Y1 - Y0

grid = [['.']*DX for _ in range(DY)]

def put(x,y,c):
    if c == 'o':
        sand[(x,y)] = c
    if X0 <= x < X1:
        if Y0 <= y < Y1:
            grid[y-Y0][x-X0] = c
            return
    print(x,y,"out of range")

def get(x,y):
    if (x,y) in sand:
        return 'o'
    if X0 <= x < X1:
        if Y0 <= y < Y1:
            return grid[y-Y0][x-X0]
    return '#'

def draw(path):
    for p1, p2 in zip(path, path[1:]):
        #print(p1, p2)
        if p1[0] == p2[0]:
            x = p1[0]
            y0, y1 = p1[1], p2[1]
            if y0 > y1:
                y0, y1 = y1, y0
            for y in range(y0, y1+1):
                put(x,y, '#')
        else:
            y = p1[1]
            x0, x1 = p1[0], p2[0]
            if x0 > x1:
                x0, x1 = x1, x0
            for x in range(x0, x1+1):
                put(x,y, '#')

for path in data:
    #print(path)
    draw(path)


def show():
    for r in grid: print("".join(r))

#show()

def drip(p):
    x,y=p
    while True:
        c = get(x,y+1)
        if c == '?':
            return 'bye'
        if c == '.':
            y += 1
            continue
        # try left
        c = get(x-1,y+1)
        if c == '?':
            return 'bye'
        if c == '.':
            x,y = x-1,y+1
            continue
        # try right
        c = get(x+1, y+1)
        if c == '?':
            return 'bye'
        if c == '.':
            x,y = x+1, y+1
            continue
        # blocked!
        put(x,y,'o')
        #print(x,y)
        return 'done'

#i = 0
#for _ in range(100000):
#    if drip(source) == 'bye':
#        break
#    i+= 1

i = 0
while source not in sand:
    drip(source)
    i += 1

#show()
print(i)