Joomla Menu and sub menus

I want to display first level of main menu under Joomla. For eg. I have menu something like this

• Heading1
  • Sub-menu1
  • Sub-menu2
  • Sub-menu3
• Heading2
• Heading3

I want to display just Heading1, Heading2, and Head开发者_StackOverflow社区ing3 not Sub-menu1,Sub-menu2, and Sub-menu3.

Any help will be appreciated. I've tried using end level and start level but nothing seems to work.

Thanks

If you are using joomla default menu module then

set start level to 0 and end level to 1 menu style should be "list" or "legacy vertical".