The Sum block is used to add multiple values.
When an input value is connected, a new additional input value appears automatically.
Example A:

Input value 5, input value 10, and input value 15 calculate the output value 30.
Result:
Sum of input summands Value 1 to Value n.
Tips and best practices:
Any number of values can be added.
All mathematical blocks can calculate floating-point numbers. The separator is a dot, not a comma. Example: 1.5 + 2.7 = 4.2
Library:
Math