#include <utility>
#include <iostream>
#include <vector>
#include <string>

void handleInput(const std::string& input, std::vector<int>* vec) {
    std::string number;
    for (char i : input) {
        if (i >= '0' && i <= '9') {
            number += i;
        } else {
            vec->push_back(std::stoi(number));
            number = "";
        }
    }
    if (!number.empty()) {
        vec->push_back(std::stoi(number));
    }
}

void selectionSort(std::vector<int>* vec, bool order = true) {
    if (vec->empty()) {
        return;
    }

    int swap_count = 0;
    for (int iter = 0; iter < vec->size() - 1; ++iter) {
        int index = iter;
        if (order) {
            for (int j = iter + 1; j < vec->size(); ++j) {
                if ((*vec)[index] > (*vec)[j]) {
                    index = j;
                }
            }
        } else {
            for (int j = iter + 1; j < vec->size(); ++j) {
                if ((*vec)[index] < (*vec)[j]) {
                    index = j;
                }
            }
        }

        if (index != iter) {
            std::swap((*vec)[iter], (*vec)[index]);
            swap_count++;
        }
    }
}

int main() {
    std::vector<int> dist;
    std::vector<int> price;
    std::string input;

    std::getline(std::cin, input);
    handleInput(input, &dist);
    std::getline(std::cin, input);
    handleInput(input, &price);

    int size = price.size();

    selectionSort(&dist);
    selectionSort(&price, false);

    int64_t sum = 0;
    for (int i = 0; i < size; ++i) {
        sum += static_cast<int64_t>(dist[i]) * price[i];
    }

    std::cout << sum;
    return 0;
}