import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)


class fenwick_tree(object):
    def __init__(self, n):
        self.n = n
        self.log = n.bit_length()
        self.data = [0] * n
        self.raw = [0] * n

    def show(self):
        res = [self.__sum(i+1) for i in range(self.n)]
        print("show", *res)

    def __sum(self, r):
        s = 0
        while r > 0:
            s += self.data[r - 1]
            r -= r & -r
        return s

    def add(self, p, x):
        """ a[p] += xを行う"""
        self.raw[p] += x
        p += 1
        while p <= self.n:
            self.data[p - 1] += x
            p += p & -p

    def sum(self, l, r):
        """a[l] + a[l+1] + .. + a[r-1]を返す"""
        return self.__sum(r) - self.__sum(l)

    def lower_bound(self, x):
        """a[0] + a[1] + .. a[i] >= x となる最小のiを返す"""
        if x <= 0:
            return -1
        i = 0
        k = 1 << self.log
        while k:
            if i + k <= self.n and self.data[i + k - 1] < x:
                x -= self.data[i + k - 1]
                i += k
            k >>= 1
        return i


N, Q = map(int, input().split())
A = list(map(int, input().split()))
query = tuple(tuple(map(int, input().split())) for _ in range(Q))

train = fenwick_tree(N)
score = fenwick_tree(N)
for i in range(N):
    train.add(i, 1)
for i, a in enumerate(A):
    score.add(i, a)

for flag, x in query:
    if flag == 1:
        if train.raw[x] == 1:
            train.add(x, -1)
    elif flag == 2:
        if train.raw[x] == 0:
            train.add(x, 1)
    elif flag == 3:
        score.add(x - 1, 1)
    else:
        t = train.sum(0, x)
        l = train.lower_bound(t)
        r = train.lower_bound(t + 1)
        print(score.sum(l, r))