#include <iostream>
#include <fstream>
#include <vector>

int part_1();
int part_2();

int main() {
    part_1();
    part_2();
}

int part_1() {
    std::vector<int> vector;
    std::ifstream input("../input.txt");
    std::string line;

    while(std::getline(input, line)) {
        int num = std::stoi(line);
        vector.push_back(num);
    }

    for (int i : vector) {
        for (int j : vector) {
            if (i + j == 2020) {
                std::cout << (i * j) << std::endl;
                return 0;
            }
        }
    }

    return 1;
}


int part_2() {
    std::vector<int> vector;
    std::ifstream input("../input.txt");
    std::string line;

    while(std::getline(input, line)) {
        int num = std::stoi(line);
        vector.push_back(num);
    }

    for (int i : vector) {
        for (int j : vector) {
            for (int k : vector) {
                if (i + j + k == 2020) {
                    std::cout << (i * j * k) << std::endl;
                    return 0;
                }
            }
        }
    }

    return 1;
}