Independent directors

The independent Directors are appointed as the additional Directors in the Board meeting and such additional independent Directors are counted in the total number of 1/3 of Directors. Nominee Directors are usually appointed by Banks, Investing Companies and financial institution by virtue of their contracct or agreement. they are usually appointed as non executive Directors , so if the articles of such Company mentions that such Directors are appointed as Non Executive Independent Director they are counted in total of 1/3 of Directors

Actually I wanted to ask that in a listed company there are 15 directors including 2 additional directors (non independent), 1 Small Shareholder Director and 1 nominee Director. 

Now which director we include for calculating 1/3rd limit 

Is it 1/3rd of 15 or 14 or 13 or likewise and why