package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func main() {
	var n int
	_, _ = fmt.Scan(&n)

	var str string
	stdin := bufio.NewScanner(os.Stdin)
	if stdin.Scan() {
		str = stdin.Text()
	}

	var sum int64
	var a string
	for {
		if str == "" {
			n, _ := strconv.ParseInt(a, 10, 64)
			sum += n
			break
		}

		s := string(str[0])
		if s == " " {
			n, _ := strconv.ParseInt(a, 10, 64)
			sum += n
			a = ""
		} else {
			a += s
		}

		str = string(str[1:])
	}

	fmt.Println(sum)
}