What is the SUM function?
A sum of a series of numbers and/or cells.
Syntax
SUM(value1, [value2, …])
Sample Usage
=SUM( 1, 2, 3, 4, 5 )
Notes about this function
This function can have 1 or more values added, separated by a comma.
If only one value is provided, that value will be the returned result.