Android Question google_play_services

in manifest editor i added

'admob interstitial
AddApplicationText(
<meta-data android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version"/>
<activity android:name="com.google.android.gms.ads.AdActivity"
android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"/>
)

but i get error:
AndroidManifest.xml:22: error: Error: No resource found that matches the given name (at 'value' with value '@integer/google_play_services_version').


any help?
thank you...