title: Calculate Maximum Value Using Sign Two Numbers String
signature: function calculate_maximum_value_using_sign_two_numbers_string(str)
test_code: 
  
  -- SOLUTION CODE
  -- ============================================
  PLACEHOLDER_CODE_BODY
  
  -- TESTING CODE 
  -- ============================================
  function isCorrect(actual, expected)
      if type(expected) ~= type(actual) then
          return false
      end
      
      if type(expected) == 'table' then
          for k,v_expected in pairs(expected) do
              
              if actual[k] == nil then
                  return false
              end
              local v_actual = actual[k]
              if not isCorrect(v_actual, v_expected) then
                  return false
              end
              actual[k]=nil
          end
      
          if next(actual) then 
              return false
          end
          return true
      else
          return actual == expected
      end
  end
  
  function validateSolution(actual, expected)
      return isCorrect(actual,expected)
  end
  
  function driver(str, expected)
      local exec_result;
      local status, error_msg = pcall(function () 
          exec_result=PLACEHOLDER_FN_NAME(str) 
      end)
      if status then
          if validateSolution(exec_result,expected) then
              return "PASSED"
          end
          return "FAILED"
      else
          return string.format("ERROR=%s",string.gsub(error_msg,".*:[%d]+: ",""))
      end
  end
      
  function main()
      result = driver("pR", 2176)
      print(string.format("TEST-0...%s",result))
  
      result = driver("9518", 368)
      print(string.format("TEST-1...%s",result))
  
      result = driver("1", 1)
      print(string.format("TEST-2...%s",result))
  
      result = driver("3170487", 6272)
      print(string.format("TEST-3...%s",result))
  
      result = driver("0100101010", 4)
      print(string.format("TEST-4...%s",result))
  
      result = driver("Z rONcUqWb", -303)
      print(string.format("TEST-5...%s",result))
  
      result = driver("00419297", 5670)
      print(string.format("TEST-6...%s",result))
  
      result = driver("00", 0)
      print(string.format("TEST-7...%s",result))
  
      result = driver("r", 66)
      print(string.format("TEST-8...%s",result))
  
  end
  
  main()
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;
  }