#include <iostream>
#include <map>

std::map<int, long> mm;

int main() {
    int n;
    long ans=0;
    std::cin >> n;
    int q,x,y;
    for(int i=0;i<n;i++) {
        std::cin >> q >> x >> y;
        if (q==0) mm[x]+=y;
        else {
            for (int j=x;j<=y;j++) {
                if (mm.find(j)!=mm.end()) {
                    ans+=mm[j];
                }
            }
        }
    }
    std::cout << ans << std::endl;
}