making an Loop with Mathcad

what i want to do is making a loop, which can do an iteration work automatically.

In this function, i put the initial value

and by using an Minerr optimization, it gives final values(which i defined as Newvalue)

and what i need to do is iteration work

so reusing this Newvalue as an initial value.

for example, if i put n=3, it should mean it iterate 3 times

for that i tried using an While loop.

but i think this is not right..because it gives same result eventhough i put different value of n.

can you help me with this problem?