Template:Sum/doc

Usage
This template performs addition. For example, if you want to add 2 and 3, use this: 5, which creates 5. It handles positive and negative integers, fractions, and decimals to thirteen decimal points:
 * -2 produces: -2
 * 1.5 produces: 1.5
 * NaN produces: NaN

It also handles some symbols such as "pi" ($\pi$):
 * NaN produces NaN

More than two parameters may be employed:
 * 2 produces 2

It does not accept commas or spaces for thousands separator.