title: Calculate Maximum Value Using Sign Two Numbers String
signature: calculate_maximum_value_using_sign_two_numbers_string <- function(str) {
test_code: 
  
  
  # SOLUTION CODE
  # ============================================
  PLACEHOLDER_CODE_BODY
  
  # TESTING CODE 
  # ============================================
  validate_solution <- function(actual, expected) {
      toString(actual)==toString(expected)
  }
  
  driver <- function(str, expected){
      if (validate_solution(PLACEHOLDER_FN_NAME(str), expected)){
          "PASSED"
      } else{
          "FAILED"
      }
  }
  
  main <- function() {
      cat(sprintf("TEST-0...%s\n",driver(
          "pR", 
          2176L
      )))
  
      cat(sprintf("TEST-1...%s\n",driver(
          "9518", 
          368L
      )))
  
      cat(sprintf("TEST-2...%s\n",driver(
          "1", 
          1L
      )))
  
      cat(sprintf("TEST-3...%s\n",driver(
          "3170487", 
          6272L
      )))
  
      cat(sprintf("TEST-4...%s\n",driver(
          "0100101010", 
          4L
      )))
  
      cat(sprintf("TEST-5...%s\n",driver(
          "Z rONcUqWb", 
          -303L
      )))
  
      cat(sprintf("TEST-6...%s\n",driver(
          "00419297", 
          5670L
      )))
  
      cat(sprintf("TEST-7...%s\n",driver(
          "00", 
          0L
      )))
  
      cat(sprintf("TEST-8...%s\n",driver(
          "r", 
          66L
      )))
  
  }
  
  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;
  }