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I've coded your problem and I will list the steps I took so you can program it.
note that type conversions may be needed.

1. you read the number into a variable
2a. make a loop
2b. in the loop...

To read an integer you should use .readInt.. There are different methods for each datatype..

For a string = readline
For a integer = readInt

And so on..

Hope this helps

If given a input which contains an upperbound, you could something along the lines like this:


Int UpperBound = input
Int Sum

For(int i; i < UpperBound; i++){
Sum += i
}

Do you have to give your new filter() a value? I mean, how does java know what you want to filter if you just say myfilter..