import java.io.FileReader;
import java.io.BufferedReader;
import java.io.IOException;
import java.util.Scanner;
import java.util.Locale;

public class ScanSum {
    public static void main(String[] args) throws IOException {
        Scanner s = null;
        double sum = 0;
        try {
            s = new Scanner(
                    new BufferedReader(new FileReader("usnumbers.txt")));
            s.useLocale(Locale.US);


            while (s.hasNext()) {
                if (s.hasNextDouble()) {
                        sum += s.nextDouble();
                    } else {
                        s.next();
                    }   
            }
        } finally {
            s.close();
        }

        System.out.println(sum);
    }
}