There is a special operator `%`

that can be used to compute the remainder
of dividing one number by another:

`alert(10 % 3); // shows 1`

If one number is evenly divisible by the second, the remainder will be zero:

`alert(10 % 2); // shows 0`

Of course, the operator `%`

can be
applied not only to numbers, but also to variables:

```
let a = 10;
let b = 3;
alert(a % b); // shows 1
```

Find the remainder after dividing the following variables:

```
let a = 13;
let b = 5;
```