Untitled

n = int(input())
cows = set()
comfy_cows = set()

def check_comfy(cow):
    neighbors = 0

    x, y = cow
    up = (x, y+1)
    down = (x, y-1)
    left = (x-1, y)
    right = (x+1, y)

    if up in cows:
        neighbors += 1
    if down in cows:
        neighbors +=1
    if left in cows:
        neighbors += 1
    if right in cows:
        neighbors +=1
    if neighbors == 3:
        return True
    else:
        return False

c = 0

for _ in range(n):
    s = input().split(" ")
    x, y = int(s[0]), int(s[1])
    cow = (x, y)
    cows.add(cow)

    if check_comfy(cow):
        comfy_cows.add(cow)

    up = (x, y+1)
    down = (x, y-1)
    left = (x-1, y)
    right = (x+1, y)

    if up in cows and up not in comfy_cows and check_comfy(up):
        c += 1
        comfy_cows.add(up)
    if up in comfy_cows and not check_comfy(up):
        c -= 1
        comfy_cows.remove(up)

    if down in cows and down not in comfy_cows and check_comfy(down):
        c += 1
        comfy_cows.add(down)
    if down in comfy_cows and not check_comfy(down):
        c -= 1
        comfy_cows.remove(down)

    if left in cows and left not in comfy_cows and check_comfy(left):
        c += 1
        comfy_cows.add(left)
    if left in comfy_cows and not check_comfy(left):
        c -= 1
        comfy_cows.remove(left)

    if right in cows and right not in comfy_cows and check_comfy(right):
        c += 1
        comfy_cows.add(right)
    if right in comfy_cows and not check_comfy(right):
        c -= 1
        comfy_cows.remove(right)

    print(c)