#include<iostream>
#include <stdlib.h>
#include <fstream>

int main()
{
    std::string filename("data.txt");
    std::ifstream input{filename};
    std::string line;
    
    int horizontal = 0;
    int vertical  = 0;

    if(!input.is_open())
    {
        std::cerr << "Couldn't read file: " << filename << "\n";
        return 1;
    }

    while(std::getline(input,line))
    {
        std::string movement = line.substr(0, line.find(" "));
        if (movement == "forward")
        {
            horizontal += stoi(line.substr(line.find(" ")));
        }
        else if (movement == "up")
        {
            vertical -= stoi(line.substr(line.find(" ")));
        }
        else
        {
            vertical += stoi(line.substr(line.find(" ")));
        }
    } 

    std::cout << horizontal * vertical << std::endl;

}