IF function with DATE in Excel

Hi, hope someone can assit. I need to create a sheet where I must take the current date and add a fulle week or two weeks to the date by selecting an opton 1 or 2.

For example, if the current date is 19/01/2015 and I add a one in A1 then B1 must show 26/01/2015 and if I enter a two in A1 the value in A1 must become 02/02/2015

Hope this makes sense?

Thanks in advance.