package main

import (
	"fmt"
	"strconv"
)

func main() {
	var score string
	var tmp int
	total := 0
	fmt.Scan(&score)
	for i := 0; i < 9; i++ {
		if score[i:i+1] == "0" {
			total += 10
		} else {
			tmp, _ = strconv.Atoi(score[i : i+1])
			total += tmp
		}
	}
	fmt.Println(total)
}