using Prompt to add a value to function

function add (digit){
var figure = digit * 1.5;

console.log("Answer is " + figure);
}

add() = parseInt(prompt(''));


I need help from someone I want to use the prompt to add a value to the add function parameter

I was expecting the prompt will pop up an input dialogue box in which I will input a value that will be placed in the add() function.

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