title: Calculate Maximum Value Using Sign Two Numbers String
signature: def calculate_maximum_value_using_sign_two_numbers_string(str):
test_code: import array
  import bisect
  import collections
  import datetime
  import functools
  import heapq
  import itertools
  import math
  import queue
  import re
  import string
  import sys
  from typing import Any, Dict, List, Optional, Set
  
  
  # SOLUTION CODE
  # ============================================
  PLACEHOLDER_CODE_BODY
  
  # TESTING CODE 
  # ============================================
  def validate_solution(actual, expected):
      return actual == expected
  
  def driver(str, expected):
      try:
          if validate_solution(PLACEHOLDER_FN_NAME(
              str),
              expected
          ):
              return "PASSED"
          return "FAILED"
      except Exception as exception_obj:
          return type(exception_obj).__name__
      
  if __name__ == "__main__":
      result = driver("pR", 2176)
      print(f"TEST-0...{result}")
  
      result = driver("9518", 368)
      print(f"TEST-1...{result}")
  
      result = driver("1", 1)
      print(f"TEST-2...{result}")
  
      result = driver("3170487", 6272)
      print(f"TEST-3...{result}")
  
      result = driver("0100101010", 4)
      print(f"TEST-4...{result}")
  
      result = driver("Z rONcUqWb", -303)
      print(f"TEST-5...{result}")
  
      result = driver("00419297", 5670)
      print(f"TEST-6...{result}")
  
      result = driver("00", 0)
      print(f"TEST-7...{result}")
  
      result = driver("r", 66)
      print(f"TEST-8...{result}")
  
      sys.exit(0)
source_py: def calculate_maximum_value_using_sign_two_numbers_string(str):
      res = (ord(str[0]) - 48)
      for i in range(1, len(str)):
          if ((str[i] == '0') or (str[i] == '1') or (res < 2)):
              res += (ord(str[i]) - 48)
          else:
              res *= (ord(str[i]) - 48)
      return res
source_cpp: int calculate_maximum_value_using_sign_two_numbers_string(string str) {
    int res = str [ 0 ] - '0';
    for ( int i = 1;
    i < str . length ( );
    i ++ ) {
      if ( str [ i ] == '0' || str [ i ] == '1' || res < 2 ) res += ( str [ i ] - '0' );
      else res *= ( str [ i ] - '0' );
    }
    return res;
  }