#include <iostream>
#include <vector>

using lint = long long;

struct Card {
    lint K, L;
    int D;
};

int main() {
    int N;
    std::cin >> N;

    std::vector<Card> cards(N);
    for (auto& c : cards) {
        std::cin >> c.K >> c.L >> c.D;
    }

    lint ok = 1LL << 60, ng = -1;
    while (ok - ng > 1) {
        lint mid = (ok + ng) / 2;
        lint num = 0;
        for (auto card : cards) {
            if (mid < card.L) continue;
            num += std::min((mid - card.L) / (1LL << card.D) + 1, card.K);
        }

        ((num & 1) ? ok : ng) = mid;
    }

    std::cout << ok << std::endl;
    return 0;
}