package main

import . "fmt"

func main() {
	var s, r string
	Scan(&s)
	var ans, x int
	Sscan(s, &ans, &r)
	for len(r) > 0 {
		s, r = r, ""
		Sscan(s[1:],&x,&r)
		if s[0] == '*' {
			ans += x
		} else {
			ans *= x
		}
	}
	Println(ans)
}