How to create a Bitwise Nand of memory cell 0 and 1, result recorded in memory cell 2

Question

i am trying to create a Nand.asm file to use in a CPUEmulator. Here is my file,

 ```
// Bitwise Nand of memory cell 0 and 1, result recorded in memory cell 2.

@0
D = M      // D = a
@2
M = D      // M[2] = a
@1
D = M      // D = b
@2
D = D & M  // D = a & b (bitwise AND)
D = !D     // D = !(a & b) (bitwise NOT of the AND operation, NAND operation)
@2
M = D      // M[2] = !(a & b)



(END)
@END
0; JMP
```

But when i try to test the file by making memory cell 0 = 3, and memory cell 1 = 5, it returns -2 into memory cell 2, which I don't think is the bitwise NAND of 3 and 5. I don't completely understand the bitwise NAND but I don't think it's right.

Could anyone help me see what im doing wrong or explain how bitwise NAND works?