//go:build ignore

// 读取不定长行：读入一行空格分隔的整数，输出它们的和
// 输入示例：1 2 3 4 5
// 输出示例：15
package main

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

func main() {
	scanner := bufio.NewScanner(os.Stdin)
	scanner.Scan()
	line := scanner.Text()

	parts := strings.Fields(line)
	sum := 0
	for _, s := range parts {
		n, _ := strconv.Atoi(s)
		sum += n
	}
	fmt.Println(sum)
}