Continue ppf account, after three years?

[>take]

I have opened account in the year 2006. Due to change in the job, I am not able to deposit any amount. So now it is 3 years, I have not deposited any money. How much amount I need to deposit If I want to continue ppf account?

Pay penalty of Rs 50 and subscription of Rs.500 for each year of default and the account will be regularised.