#Python 1,2,3, Pyth, Seriously 40 bytes/5^3 = 0.32

 #4X.q5
 import sys
 print(sys.version[0])

**Python 1,2,3 prints their version**

This is based on the same code by sweerpotato. The # starts a comment so the first line is not compiled.

**Pyth prints `4`**

`#4X.q` starts a while loop, X does something unnecessary, and .q quits the program.

**Seriously prints `5`**

`#4X.q5` starts out with # which does nothing, then 4 is pushed to the stack, X clears the stack, .q does nothing, and 5 is pushed on the stack and an invisible character (hex code `7f`) quits the program and prints what is on the stack.