In this section, you will find a step by step to manipulate basic inputs on Ritchie.

On this tutorial, the idea is to teach you how to create a formula on Ritchie that will **sum two positive numbers**.

Command suggestion: `rit math sum numbers`

This formula needs to contain (at least) those two inputs parameters, see below:

Number one (

`RIT_NUMBER_ONE`

).Number two (

`RIT_NUMBER_TWO`

).

The formula needs to follow the next steps:

Extract all inputs parameters.

Convert inputs to integers (there is currently no

**integer**`type`

in inputs config.json file).Sum both numbers.

Return the result on the terminal.

Well done! You've completed the first task!

If you want to play a little more, here are some suggestions:

Add a validation of the input parameters to return an error to the user if the parameter is not an integer.

Allow the user to sum negative numbers with positive ones.

Allow the user to digit decimals in addition to integers.

👉 If you've completed the first challenge, let's go to the **level 2 task**!