#include <bits/stdc++.h>

using namespace std;

using int64 = long long;

template< class T >
struct BinaryIndexedTree {
  unordered_map< int, T > data;

  BinaryIndexedTree() {
  }

  T sum(int k) {
    T ret = 0;
    for(++k; k > 0; k -= k & -k) {
      if(data.count(k)) ret += data[k];
    }
    return (ret);
  }

  void add(int k, T x) {
    for(++k; k <= (int) (1e9); k += k & -k) data[k] += x;
  }
};

int main() {
  int Q;
  cin >> Q;
  BinaryIndexedTree< int > bit;
  int64 add = 0;
  while(Q--) {
    int t, x, y;
    cin >> t >> x >> y;
    if(t == 0) bit.add(x, y);
    else add += bit.sum(y) - bit.sum(x - 1);
  }
  cout << add << endl;
}