How to multiply int Random by int in C#

I've got a little problem - I'm trying to multiply random by int in console app. And I've got an error:

Operator '*' cannot be applied to operands of Type 'Random' and 'int'

I've tride: rndAttackPoints = attackPoints and then

this int damagePoints = (rndAttackPoints * strenghtPoints1) - defencePoints1; into

this int damagePoints = (attackPoints * strenghtPoints1) - defencePoints1; but this didn't work.

So I'm asking you, do you know how to multiply Random by int in C#?

            //Elf
            int healthPoints1 = 100;
            int defencePoints1 = 3;
            int strenghtPoints1 = 2;

            // Goblin
            int healthPoints2 = 100;
            int defencePoints2 = 5;
            int strenghtPoints2 = 1;

            Random rndAttackPoints = new Random();            
            Console.WriteLine($"You've attacked: {rndAttackPoints.Next(5, 10)} HP");

            int damagePoints = (rndAttackPoints * strenghtPoints1) - defencePoints1;