31881번: K512에 바이러스 퍼뜨리기 ↗

"""
[31881: K512에 바이러스 퍼뜨리기](https://www.acmicpc.net/problem/31881)

Tier: Bronze 2 
Category: implementation, simulation
"""

import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from datetime import datetime, timedelta

SYS_INPUT = True
RECURSION_LIMIT = 10 ** 7
SET_RECURSION = False
BLANK = " "

if SET_RECURSION:
  sys.setrecursionlimit(RECURSION_LIMIT)

inp = lambda : sys.stdin.readline().rstrip() if SYS_INPUT else input()
mii = lambda : [*map(int,inp().split())]
mfi = lambda : [*map(float,inp().split())]
ii = lambda : int(inp())
fi = lambda : float(inp())
isplit = lambda : inp().split()
p = print

def gcd(a, b): return gcd(b, a % b) if b > 0 else a
def lcm(a, b): return a * b // gcd(a, b)

def solve():
  n, q = mii()

  status = [False for _ in range(n)]
  current = n

  for _ in range(q):
    query = mii()

    if query[0] == 1:
      if status[query[1] - 1] == False:
        current -= 1
      status[query[1] - 1] = True
    elif query[0] == 2:
      if status[query[1] - 1] == True:
        current += 1
      status[query[1] - 1] = False
    else:
      p(current)

if __name__ == "__main__":
  tc = 1
  for t in range(1, tc+1):
    ret = solve()