I have a python script which takes a numerical argument and can take 2 options with numerical values. With no options the script prints the argument back. With the -a option you can pass a number to add to the argument, so 'script 1 -a 1 will return the sum of 1 and 1 which is 2. With the -m option you can pass a number to multiply with the argument, so 'script 2 -m 3' will return the product of 2 and 3 which is 6. I will call the script with the argument 3 and I want the script to return 4, how should I call the script?