# NaN value

The value `NaN` means Not-A-Number. This value is obtained when you try to do mathematical operations not with numbers, but with something else. For example, an attempt to multiply a string by a number will give such a value:

`alert('abc' * 3); // shows NaN`

Any operations with `NaN` still lead to the `NaN` result:

`alert(NaN + 1); // shows NaN`

Make two strings. Multiply them over each other. Print the result of the multiplication on the screen.

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