Credit VaR - Calculation Help!!

Is this understanding correct:

If N=20, port Value = 1000Mn, Var Conf Level = 95%,

Then, Unexp loss = (1 - conf level) * N * Port value

= 5% * 20 * 50Mn i.e. (1000Mn/20)

Where No. of defaults = 20 * 5% = 1