package main

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

var sc = bufio.NewScanner(os.Stdin)

func main() {
	sc.Split(bufio.ScanWords)
	s := nextLine()
	s = strings.Replace(s, "*", " * ", -1)
	s = strings.Replace(s, "+", " + ", -1)

	expr := strings.Split(s, " ")
	n, _ := strconv.Atoi(expr[0])
	for i := 1; i < len(expr)-1; i += 2 {
		v, _ := strconv.Atoi(expr[i+1])
		switch expr[i] {
		case "*":
			n += v
		case "+":
			n *= v
		}
	}
	fmt.Println(n)
}

func nextLine() string {
	sc.Scan()
	return sc.Text()
}

func nextInt() int {
	i, _ := strconv.Atoi(nextLine())
	return i
}

func nextInt64() int64 {
	i, _ := strconv.ParseInt(nextLine(), 10, 64)
	return i
}

func nextUint64() uint64 {
	i, _ := strconv.ParseUint(nextLine(), 10, 64)
	return i
}

func nextFloat() float64 {
	f, _ := strconv.ParseFloat(nextLine(), 64)
	return f
}