#include <bits/stdc++.h>
using namespace std;
const int MAX = 1000000001;
unordered_map<int, int> B;
void add(int i, int x){
    for(i+=1;i<=MAX;i+=i&-i){
        if(!B.count(i))B[i] = 0;
        B[i] += x;
    }
}
int acc(int i){
    int res = 0;
    for(;i>0;i-=i&-i){
        if(B.count(i))res += B[i];
    }
    return res;
}
int prod(int l, int r){
    return acc(r) - acc(l);
}

int main(){
    int q;
    cin >> q;
    int ans = 0;
    while(q--){
        int t, p, x;
        cin >> t >> p >> x;
        if(!t){
            add(p, x);
        }else{
            ans += prod(p, x+1);
        }
    }
    cout << ans << endl;
}