@echo off
setlocal enabledelayedexpansion
for /f "tokens=*" %%i in ('dir/b ??.txt') do (
set n=
(for /f "tokens=*" %%j in ('type %%i') do (
set /a n+=1
set s=%%j
set m=!s!
if "!n!"=="1" set /a m=!s!+7
if "!n!"=="2" set /a m=!s!+3
echo !m!))>temp.txt
move /y temp.txt %%i
)
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