"the SA (slave address) feature allows connecting up to 127 devices (SA=0x00...0x07F) with only 2 wires" From the Datasheet: https://www.sparkfun.com/datasheets/Sensors/Temperature/SEN-09570-datasheet-3901090614M005.pdf
that is a hexadecimal address, if you don't know what hex is Google it (or Hexadecimal - Wikipedia)
Little tip, always read the datasheet thoroughly. I promise you 90% of the questions you'll have that are hardware specific (like addresses) are in the datasheet.