Logic needed for Header and items dynamic value

Hi Experts,

I have a scenario where in the xml file one header is there with multiple items.

Like

Header1

header2

header3

Iteml level 1

item a

item b

itemc

Item Level 2

Item a

item b

item c

Item Level 3

Item a

item b

item c

So item b and c can have a value of 1 or 2. whenever the item b and c valuse does not match we will send header 3 value as N. if it matches in all the items the we will send value in header 3 as Y.