setlocal delayexpansion
set a=1
set b=1
set c=10000000
@echo off
@cls
:loop
set /a c=c+(10000000/b)
set /a a=a+1
set /a b=b*a
if %a% equ 500 goto :ex
goto :loop
:ex
set /a c=c-20000000
@echo E is 2.%c%
@echo off
@pause>nul
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