import java.io.*;
import java.util.*;
import java.math.*;

class Main {
	
	public static void out (Object o) {
		System.out.println(o);
	}
	
	public static void main (String[] args) throws IOException {
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		
		char[] c = br.readLine().toCharArray();
		boolean isAdd = true;
		int ans = 0, i = 0;
		
		while (i < c.length) {
			int work = 0;
			int j = i;
			while (j < c.length && (c[j] + "").matches("[0-9]")) {
				work = work * 10 + (c[j++] - '0');
			}
			ans = isAdd ? ans + work : ans * work;
			if (j < c.length) isAdd = c[j++] == '*';
			i = j;
		}
		
		out(ans);
	}
}