We use variables for *storing data*. They have a **name** and a **type**.
The type says what type of data we can store in it.
For example, if we are calculating total amount we spent on some items, we could use these 3 variables:

`amount`

that has type`Integer`

`price`

that has type`Real`

`total`

that has type`Real`

Before we use it, we must **declare a variable**. Right click on the edge and add a "Declare" block. Click on it and then:

- Enter
`amount`

for variable name - Select
`Integer`

for its type - Enter
`3`

for its initial value

Do the same for `price`

, set its type to `Real`

and value to `1.5`

Now we can finally calculate the total amount.
Declare `total`

, set its type to `Real`

and value to `amount * price`

This last part is very important. You can use variable name as a value!
Of course, you should also add "Output" with value `total`

, so you can see that it works!