import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)

MAX = 10 ** 9 + 5
d = dict()


def _sum(i):
    res = 0
    while i > 0:
        res += d.get(i - 1, 0)
        i -= i & -i
    return res


def add(i, x):
    i += 1
    tmp = dict()
    while i < MAX:
        tmp[i - 1] = x + d.get(i - 1, 0)
        i += i & -i
    d.update(tmp)


def bitsum(l, r):
    return _sum(r) - _sum(l)



n = int(input())
ans = 0
for _ in range(n):
    k, x, y = map(int, input().split())
    if k == 0:
        add(x, y)
    else:
        ans += bitsum(x, y + 1)
print(ans)