A simple program to add two numbers together.

Description:	Sum = X + Y
Parameter Lines:	29: X 30: Y
Result Lines:	31: Sum

01: LDN 29  -- A = -X
02: SUB 30  -- A = -X - Y
03: STO 31  -- store -Sum
04: LDN 31  -- A = -(-Sum)
05: STO 31  -- store Sum
06: HLT

29: NUM 5   -- X Parameter
30: NUM 3   -- Y Parameter
31:         -- Sum Result will appear here