import sys
input = sys.stdin.readline

n=int(input())
Q=[list(map(int,input().split())) for i in range(n)]

LIST=[]
for x,a,b in Q:
    if x==0:
        LIST.append(a)
    else:
        LIST.append(a)
        LIST.append(b)

LIST.sort()
N=len(LIST)
DICT=dict()

for i in range(N):
    DICT[LIST[i]]=i

BIT=[0]*N

def update(v,w):#vにwを加える
    while v<N:
        BIT[v]+=w
        v+=(v&(-v))

def getvalue(v):#0～vの区間の和を求める
    ANS=0
    while v>0:
        ANS+=BIT[v]
        v-=(v&(-v))
    return ANS

ANS=0
for x,a,b in Q:
    if x==0:
        update(DICT[a],b)
    else:
        ANS+=getvalue(DICT[b])-getvalue(DICT[a]-1)

print(ANS)