New at programming, need a suggestion or two.

Question

Hello, I'm 16 and brand new at C#.  Problem is, I want to attempt a program of my own (not a pre-written example), but I don't know what to make.   So far, I know how to take input text, how to use integer variables (int, double, etc), how to use if/else statements,  basic math   (+,-,*,div, %), booleans (>=,==, etc),  make the computer print stuff (on screen),  escape thingies   (   /n,   /t,  //,  etc.   lol, thingies),  and  the +=, *=, etc operators.

What I'm looking for is a suggestion as to what I should make my program do, any input will be greatly appreciated.  Thank you in advance.

~Skularach