def inpt():
    return sys.stdin.readline().strip()


class read:
    @staticmethod
    def int():
        return int(inpt())

    @staticmethod
    def list(sep=' '):
        return inpt().split(sep)

    @staticmethod
    def list_int(sep=' '):
        return list(map(int, inpt().split(sep)))

n=int(inpt())
poezd=[]
gruz=dict()
for i in range(n):
    s=inpt().split()
    if s[0]=="add":
        name=s[2]
        k=int(s[1])
        if name not in gruz:
            gruz[name]=k
        else:
            gruz[name]+=k
        poezd.append((k,name))
    elif s[0]=="get":
        name=s[1]
        if name not in gruz:
            print(0)
        else:
            print(gruz[name])
    elif s[0]=="delete":
        k=int(s[1])
        while k!=0:
            vag=poezd.pop()
            if k>=vag[0]:
                k-=vag[0]
                gruz[vag[1]]-=vag[0]
            else:
                vv=vag[0]-k
                gruz[vag[1]]-=k
                poezd.append((vv,vag[1]))
                k=0