# coding: utf-8
# Your code here!
n=int(input())
q=[]
toad={}
adset=set()
for i in range(n):
    q.append(list(map(int,input().split())))
    adset.add(q[i][1])
    if q[i][0]:
        adset.add(q[i][2])
adset=list(adset)
adset.sort()
for i in range(len(adset)):
    toad[adset[i]]=i
l=[0 for i in range(len(adset))]
c=0
for i in q:
    if i[0]==0:
        l[toad[i[1]]]+=i[2]
    else:
        for j in range(toad[i[1]],toad[i[2]]+1):
            c+=l[j]
print(c)