class DynamicBIT:
    def __init__(self, MAX=10**9):
        self.data = dict()
        self.MAX = MAX
    def add(self, i, x):
        i += 1
        while i <= self.MAX:
            if i not in self.data:
                self.data[i] = 0
            self.data[i] += x
            i += i & -i
    def acc(self, i):
        res = 0
        while i:
            if i in self.data:
                res += self.data[i]
            i -= i & -i
        return res
    def prod(self, l, r):
        return self.acc(r) - self.acc(l)


import sys
input = sys.stdin.readline

q = int(input())
B = DynamicBIT(10**9+1)
ans = 0
for _ in range(q):
    t, p, x = map(int, input().split())
    if t == 0:
        B.add(p, x)
    else:
        ans += B.prod(p, x+1)
print(ans)