import java.util.Scanner;

public class Sansunoshukudai {
	static StringBuilder str = new StringBuilder();

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner s = new Scanner(System.in);
		str.append(s.nextLine());
		s.close();
		int sum = 0;
		while(str.length() != 0){
			char c = str.charAt(0);
			if(c == '*'){
				str.deleteCharAt(0);
				sum += getnum();
			}else if(c == '+'){
				str.deleteCharAt(0);
				sum *= getnum();
			}else{
				sum += getnum();
			}
		}
		System.out.println(sum);

	}
	static int getnum(){
		int p = str.indexOf("*");
		int m = str.indexOf("+");
		int num = 0;
		if(p != -1 && m != -1){
			num = Integer.parseInt(str.substring(0, Math.min(p, m)));
			str.delete(0, Math.min(p, m));
		}else if(p != -1){
			num = Integer.parseInt(str.substring(0, p));
			str.delete(0, p);
		}else if(m != -1){
			num = Integer.parseInt(str.substring(0, m));
			str.delete(0, m);
		}else{
			num = Integer.parseInt(str.toString());
			str.delete(0, str.length());
		}
		return num;
	}

}