Day 1, Part 1

import java.Math;
import java.util.Scanner;
import java.io.*;

public class Fuel {

    public static void main (String[] args) throws IOException{

        int sum = 0;

        File input = new File("modules.txt");
        Scanner modules = new Scanner(input);

        FileWriter output = new FileWriter("answer.txt");

        while(modules.hasNext()){
            int mass = modules.nextInt();
            double fuel = (mass / 3);
            fuel = (Math.round(fuel))-2;
            sum += fuel;
        };

        System.out.println("The total fuel required is " + sum);
        output.write(sum);

    };

};