import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String S = sc.next();
        String [] ss = S.split("\\*|\\+");
        int [] n = new int [ss.length];
        
        for(int i=0; i<ss.length; i++){
            n[i] = Integer.parseInt(ss[i]);
        }
        int r = n[0];
        int i = 1;
        int a = ind(S,"*");
        int b = ind(S,"+");
        int min = Math.min(a,b);
        while(true){
            String t =S.substring(min,min+1);
            if( t.equals("*") ){
                r=r+n[i];
            }else{
                r=r*n[i];
            }
            i++;
            S = S.substring(min+1);
            a = ind(S,"*");
            b = ind(S,"+");
            if(a==b){break;}
            min = Math.min(a,b);
        }
        System.out.println(r);
    }
    static int ind(String a, String b){
        int x = a.indexOf(b);
        if(x==-1){
            x=Integer.MAX_VALUE;
        }
        return x;
    }
}