FizzBuzz

Print numbers from 1 to 20, but:

• If divisible by 3, print Fizz instead
• If divisible by 5, print Buzz instead
• If divisible by both 3 and 5, print FizzBuzz instead

Expected output (first 15 lines):

1
2
Fizz
4
Buzz
Fizz
7
8
Fizz
Buzz
11
Fizz
13
14
FizzBuzz