import java.util.Arrays;
import java.util.LinkedList;
import java.util.Scanner;

public class Main {
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		char[] inputs = sc.next().toCharArray();
		
		int pos = 0;
		int current = 0;
		while('0' <= inputs[pos] && inputs[pos] <= '9'){
			current *= 10;
			current += Character.getNumericValue(inputs[pos]);
			pos++;
		}
		
		while(pos < inputs.length){
			boolean plus = inputs[pos++] == '*';
			
			int snd = 0;
			while(pos < inputs.length && '0' <= inputs[pos] && inputs[pos] <= '9'){
				snd *= 10;
				snd += Character.getNumericValue(inputs[pos]);
				pos++;
			}
			
			if(plus){
				current += snd;
			}else{
				current *= snd;
			}
		}
		
		System.out.println(current);
	}
	
}