Probably one of the most widely used MSI arithmetic circuits is the 74283 4-bit adder. Several of them could be wired in series to perform 8-bit, 16 bit or even 32-bit operations.

This is the internal circuitry of a 74HC283 from Philips:

![enter image description here][1]


which  shows it is clearly of MSI complexity.


  [1]: https://i.sstatic.net/CSwDh.jpg