#include <fstream>
#include <iostream>
#include <cstring>

int main() {

    std::ifstream in("input.txt");

    int k = 0, x;
    int* sizeArr = new int[k];
    while (in >> x) {
        //std::cout << x << "\n";
        ++k;
        int* new_sizeArr = new int[k];
        std::memcpy(new_sizeArr, sizeArr, sizeof(sizeArr[0]) * (k - 1));
        new_sizeArr[k - 1] = x;

        delete[] sizeArr;
        sizeArr = new_sizeArr;
    }

    long long size = 1, sum = 0;
    int** arr = new int*[k];

    for (int i = 0; i < k; ++i) {
        arr[i] = new int[sizeArr[i]];

        sum = 0;
        for (int j = 0; j < sizeArr[i]; ++j) {
            std::cin >> arr[i][j];
            sum += arr[i][j];
        }
        size *= sum;
    }

    std::cout << size << "\n";

    delete[] sizeArr;
    for (int i = 0; i < k; ++i) {
        delete[] arr[i];
    }

    delete[] arr;
    return 0;
}