Given an integer as input, can you round it to the next (meaning, "higher") 5?
Examples:
input: output:
0 -> 0
2 -> 5
3 -> 5
12 -> 15
21 -> 25
30 -> 30
-2 -> 0
-5 -> -5
etc.
Input may be any positive or negative integer (including 0).
You can assume that all inputs are valid integers.