import java.io.File;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Scanner;

public class Problem_08_SumNumbersFromTextFile {
    public static void main(String[] args) {
        boolean fileExist = true;
        Scanner fileReader = null;
        long sum = 0L;
        Path currentRelativePath = Paths.get("");
        String pathToFile = currentRelativePath.toAbsolutePath().toString();

        try {
            File file = new File(pathToFile + "\\src\\input.txt");
            fileReader = new Scanner(file);
            int lineNumber = 0;
            while (fileReader.hasNextLine()) {
                lineNumber++;
                sum += Long.parseLong(fileReader.nextLine());
            }

        }

        catch (IOException IOexception){
            fileExist = false;
            System.out.println("error");
        }

        if (fileExist) {
            System.out.println(sum);
            fileReader.close();
        }

    }
}