n = int(input())
q = []
for i in range(n):
    q.append(list(map(int ,input().split())))
a = [0] * 1000000000
ans = 0
for i in q:
    if i[0] == 0:
        a[i[1]] += i[2]
    if i[0] == 1:
        ans += sum(a[i[1]:i[2]+1])
print(ans)