Hint $1$: A smaller distance means two templates being more similar. Assume a user will be accepted if the distance is smaller $(<)$ than the threshold, but will be rejected if greater than or equal to $(>=)$ the threshold. Moving the $$equal to$(=)$ to the former will change the results to some extent but not significantly.

Hint $2$: If you are really struck with writing a program to do this exercise, use Excel to do the calculation instead.