Suppose that a website allows its users to pick their own usernames for accounts, but imposes some restrictions. The $1$st character must be an upper$-$case letter in the English alphabet. The $2$nd through $6$th characters can be letters $($both upper$-$case and lower$-$case allowed$)$ in the English alphabet or decimal digits $(09).$ The $7$th position must be $$@$$ or $..$ The $8$th through $12$th positions allow lower$-$ case English letters, $*,\%,$ and $$#$.$ The $13$th position must be a digit $(1-5).$ How many users can the website accept registrations from?