import java.util.Scanner;

public class pre {
    public static void main(String[] args) {

        Scanner s = new Scanner(System.in);
		String math = s.next();
		int ans = Integer.parseInt(String.valueOf(math.charAt(0)));
		
		for(int i=1;i<math.length();i++){
			if(String.valueOf(math.charAt(i)).equals("*") || String.valueOf(math.charAt(i)).equals("+")){
				i++;
			}
			
			if(String.valueOf(math.charAt(i-1)).equals("*")){
				ans = ans + Integer.parseInt(String.valueOf(math.charAt(i)));
			}
			else if(String.valueOf(math.charAt(i-1)).equals("+")){
				ans = ans * Integer.parseInt(String.valueOf(math.charAt(i)));
			}
		}
		
		System.out.println(ans);
    }
}