// No.2224 UFO Game
package main

import (
	"fmt"
	"math"
	"strconv"
	"strings"
)

func main() {
	var s string
	fmt.Scan(&s)

	if strings.Contains(s, "x") {
		s2 := strings.Replace(s, "x", "", 1)
		x, _ := strconv.Atoi(s2)
		fmt.Println(int(math.Pow(2.0, 32.0)) - x)
	} else {
		fmt.Println(s)
	}
}