I'm trying recursion.

I just want the output to be the result of multiplying the input by 2: `output = 2*input`.

It should be like this, why is it not working?

```
function fE(f) {
  if(f < 0){
    return 1;}
  else{
  return f + fE(f);}

}

console.log(fE(3)); // output 6
console.log(fE(6)); // 12

```