--- Day 12: Leonardo's Monorail ---

The assembunny code you've got operates on four registers (a, b, c, and d) that start at 0 and can hold any integer. However, it seems to make use of only a few instructions:

• inc x increases the value of register x by one.
• dec x decreases the value of register x by one.
• cpy x y copies x (either an integer or the value of a register) into register y.
• jnz x y jumps to an instruction y away (positive means forward; negative means backward), but only if x is not zero.

The jnz instruction moves relative to itself: an offset of -1 would continue at the previous instruction, while an offset of 2 would skip over the next instruction.

For example:

cpy 41 a
inc a
inc a
dec a
jnz a 2
dec a

The above code would set register a to 41, increase its value by 2, decrease its value by 1, and then skip the last dec a (because a is not zero, so the jnz a 2 skips it), leaving register a at 42. When you move past the last instruction, the program halts.

After executing the assembunny code in your puzzle input, what value is left in register a?

318003