import java.util.*;
import java.io.*;

class ReadIntegers2 {
    public static void main(String[] args) {
        Reader filein;
        try {
            filein = new BufferedReader( new FileReader("numbers-errors.txt") );
        } catch (FileNotFoundException e) {
            System.err.println("Couldn't open file.");
            return;  // exit main() & stop program
        }

        Scanner scanfile = new Scanner(filein);
        int total = 0;
        boolean done = false;
            
        while ( !done ) {
            try {
                total += scanfile.nextInt();
            } catch (InputMismatchException e) {
                // not an integer: eat rest of line
                scanfile.nextLine();
            } catch (NoSuchElementException e) {
                // end of file
                done = true; 
            }
        }
        System.out.println(total);
        
    }
}