Arithmetic: multiplication
	UB multiplication also follows the same rules as ordinary arithmetic
		carry		0	1	1	1	0	0
							0	1	0	1		5
							0	1	1	1		7
							0	1	0	1
						0	1	0	1
					0	1	0	1
				0	0	0	0
		result		0	1	0	0	0	1	1		35
	Notice that the operations can be carried out using just add and shift