import sys
input = sys.stdin.readline
#print = sys.stdout.write
class BIT:
    def __init__(self,N):
        self.N = N
        self.data = dict()
    def add(self,i,x):
        i += 1
        while i <= self.N:
            if i in self.data:
                self.data[i] += x
            else:
                self.data[i] = x
            i += i&-i
    def fold(self,l,r):
        res = 0
        while r > 0:
            if r in self.data:
                res += self.data[r]
            r -= r&-r
        while l > 0:
            if l in self.data:
                res -= self.data[l]
            l -= l&-l
        return res


bit = BIT(1000000001)
Q = int(input())
ans = 0
for _ in range(Q):
    op,x,y = map(int,input().split())
    if op == 0:
        bit.add(x,y)
    else:
        ans += bit.fold(x,y+1)
print(ans)