This part is a kind of semiconductor called 7483.

Function of this product has 4-BIT BINARY FULL ADDER W/FAST CARRY.

Manufacturers : ETC

Image and pinout :

Some of the text within the PDF file :

B3 S3 COUT CIN GND B0 A0 S0 16 15 14 13 12 11 10 9 Adder A3 B3 CO3 CI3 S3 Adder A2 B2 CO2 CI2 S2 Adder A1 B1 CO1 CI1 S1 Adder A0 B0 CO0 CI0 S0 1 2 34 5 6 78 A3 S2 A2 B2 Vcc S1 B1 A1 7483: 4-BIT BINARY FULL ADDER W/FAST CARRY [ ... ]

7483 PDF Datasheet Download