#include <iostream>
#include <vector>

using namespace std;

int main() {
    int n;
    cin >> n;
    
    vector<vector<int> > records(n, vector<int>(3));
    for (int i = 0; i < n; ++i) {
        cin >> records[i][0] >> records[i][1] >> records[i][2];
    }
    
    int metro_cost = 0;
    int bus_cost = 0;
    int coupons = 0;
    
    for (int i = 0; i < n; ++i) {
        int vehicle_type = records[i][0];
        int price = records[i][1];
        int time = records[i][2];
        
        if (vehicle_type == 0) {  // 地铁
            if (coupons > 0 && time - records[i-1][2] <= 45) {  // 可以使用优惠票
                coupons -= 1;
            } else {  // 需要支付地铁票价
                metro_cost += price;
                coupons = 1;
            }
        }
        
        if (vehicle_type == 1) {  // 公交车
            if (coupons > 0) {  // 可以使用优惠票
                bus_cost += 0;  // 不产生额外费用
                coupons -= 1;
            } else {  // 需要支付公交车票价
                bus_cost += price;
            }
        }
    }
    
    int total_cost = metro_cost + bus_cost;
    cout << total_cost << endl;
    
    return 0;
}