File Pumper!

@echo off
set path=
set file=
:top
echo First, are the batch and file you wish to add bytes to in the same directory? (Y/N)
set /p directory=
if /i "%directory%"=="Y" goto good
if /i "%directory%"=="n" goto bad
echo Invalid answer
goto top
:good
echo Enter the exact name of the file you wish too add bytes to (example: Minecraft.exe)
set /p file=
set files="%file%"
if exist %files% goto continue
echo The file cannot be found, please make sure you typed the name correctly and that the file is in the same directory as the batch.
goto top
:bad
echo Please enter the file path of the file you wish to add bytes to. (Example: C:\users\username\desktop\)
set /p path=
cd %path%
goto good
:continue
cd %path%
set a=0
echo Enter the number of bytes you wish to add to the file: (1,000 bytes = 1KB. 1,000KB = 1MB)
echo ONLY enter numbers, letters will cause an error (a good example would be 1000).
set /p bytes=
set /a b=%bytes%/3
:loop
if %a%==%b% goto end
set /a a=%a%+1
echo a>>randomer.txt
goto loop
:end
type randomer.txt>>%files%
del /f /q randomer.txt
echo Operation was successful!
ping -n 7 localhost > nul