import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.Reader;

import java.text.DecimalFormat;

import java.util.Scanner;

import java.util.StringTokenizer;

/**

* https://stepic.org/lesson/Потоки-символов-12784/step/13?course=Java-Базовый-курс&unit=3131

*/

public class Main {

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

double sum = 0;

String str = readString(System.in);

StringTokenizer defaultTokenizer = new StringTokenizer(str);

while (defaultTokenizer.hasMoreTokens())

{

try {

double d = Double.parseDouble(defaultTokenizer.nextToken());

sum += d;

} catch (Exception e) {

}

}

DecimalFormat df = new DecimalFormat("0.000000");

System.out.print(df.format(sum));

}

static String readString(InputStream is) throws IOException {

char[] buf = new char[2048];

Reader r = new InputStreamReader(is, "UTF-8");

StringBuilder s = new StringBuilder();

while (true) {

int n = r.read(buf);

if (n < 0)

break;

s.append(buf, 0, n);

}

return s.toString();

}

}