#!/usr/bin/env python

import copy

Q = int(input())
events = []
for i in range(Q):
    events.append([int(x) for x in input().split()])

N = 0
addlist = [0]
keylist = []
dp = {}
for event in events:
    if event[0] == 1:
        x = event[1]
        N += 1
        addlist.append(x)
        keylist = sorted(list(set(keylist + [x])))
        for k in keylist:
            if k >= x:
                break
            else:
                dp[k] += 1
        if x in dp.keys():
            dp[x] += 1
        elif x == keylist[-1]:
            dp[x] = 1
        else:
            dp[x] = dp[keylist[keylist.index(x)+1]] + 1
    elif event[0] == 2:
        N -= 1
        if N == 0:
            dp = {}
            keylist = []
        else:
            x = addlist[event[1]]
            for k in keylist:
                if k > x:
                    break
                else:
                    dp[k] = max(0, dp[k] - 1)
            i = 0
            while i < len(keylist)-1:
                if dp[keylist[i]] == dp[keylist[i+1]]:
                    del dp[keylist[i]]
                    del keylist[i]
                else:
                    i += 1
    elif event[0] == 3:
        x = event[1]
        addlist = [v+x for v in addlist]
        keylist = [k+x for k in keylist]
        dp_new = {k:dp[k-x] for k in keylist}
        dp = copy.deepcopy(dp_new)

    ansdp = [(k, v) for k, v in dp.items() if k >= 0]
    if len(ansdp) == 0:
        print(0)
    else:
        ansdp.sort(reverse=True)
        for i, val in enumerate(ansdp):
            if val[1] >= val[0]:
                print(val[0])
                break
            elif i+1 == len(ansdp):
                print(val[1])
                break
            elif val[1] >= ansdp[i+1][0]:
                print(val[1])
                break
            else:
                continue