import sys
input = sys.stdin.readline
#print = sys.stdout.write
class SegTree:
    def __init__(self,N,op,identity):
        self.op = op
        self.identity = identity
        self.N = N
        self.data = dict()
    def __getitem__(self,key):
        key += self.N
        if key in self.data:
            return self.data[key]
        else:
            return self.identity
    def set_value(self,x,val):
        x += self.N
        self.data[x] = val
        while x > 1:
            x >>= 1
            if x<<1|0 in self.data:
                l = self.data[x<<1|0]
            else:
                l = self.identity
            if x<<1|1 in self.data:
                r = self.data[x<<1|1]
            else:
                r = self.identity
            self.data[x] = self.op(l,r)
    def fold(self,l,r):
        res = self.identity
        l,r = l+self.N,r+self.N
        while l < r:
            if l&1:
                if l in self.data:
                    lv = self.data[l]
                else:
                    lv = self.identity
                res = self.op(res,lv)
                l += 1
            if r&1:
                r -= 1
                if r in self.data:
                    rv = self.data[r]
                else:
                    rv = self.identity
                res = self.op(res,rv)
            l,r = l>>1,r>>1
        return res


seg = SegTree(1000000001,lambda x,y:x+y,0)
Q = int(input())
ans = 0
for _ in range(Q):
    op,x,y = map(int,input().split())
    if op == 0:
        seg.set_value(x,seg[x]+y)
    else:
        ans += seg.fold(x,y+1)
print(ans)