import java.math.BigDecimal;
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class _Problem_3_SimpleExpression {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        String[] parts = in.nextLine().split(" ");
        String expression = "";
        for (String part : parts) {
            expression += part;
        }
        Pattern pattern = Pattern.compile("-[0-9. ]+|[0-9.]+");
        Matcher m = pattern.matcher(expression);
        BigDecimal result = new BigDecimal("0");
        while (m.find()) {
            result = result.add(new BigDecimal(m.group()));
        }
        System.out.println(result);
    }
}