I lost my os in my macbook air.i wanted to download and instal os

i sir
iam using macbook air.i mistakely deleted my mac os.help me to get it back

OS X Version?
Reinstall OS X
Mountain Lion
http://support.apple.com/kb/PH10763?viewlocale=en_US
Mavericks
http://support.apple.com/kb/PH13871

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    Your warranty includes 90 days of phone support. Contact Apple.

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