Trash World News 2

"Add the first two values of file 200, multiply the result by the third value, and then subtract the fourth value. Append the result to the end of the file and then move it to the outbox."
 * This is a tutorial mission. The answer can be found in the first issue of the zine.
 * When numbers are stored in a file in the order you need them for math, you can do math with the F register directly.
 * Note that the finished file must be dropped in the outbox, not your host.