Train

train = []
counts = dict()

def push(cnt, name):
    counts[name] = counts.get(name, 0) + cnt
    if len(train) > 0 and train[-1][0] == name:
        train[-1][1] += cnt
    else:
        train.append( [name, cnt] )

def pop(t):
    while train[-1][1] < t:
        t -= train[-1][1]
        counts[train[-1][0]] -= train[-1][1]
        train.pop()
    train[-1][1] -= t
    counts[train[-1][0]] -= t

n = int(input())
for i in range(n):
    lst = input().split()
    if lst[0] == 'add':
        cmd, cnt, loot = lst
        cnt = int(cnt)
        push( cnt, loot )
    elif lst[0] == 'delete':
        cmd, cnt = lst
        cnt = int(cnt)
        pop(cnt)
    else:
        cmd, loot = lst
        print( counts.get(loot, 0) )