Adding Integer Value To Date Time

I am trying to add integer value to the datetime to get the configurable "date".But it is not working out. Here is the code for it.

declare @Id int;
exec @Id = up_GetConfigurableDayInterval
print getdate() + @Id

The sp "up_GetConfigurableDayInterval", will return number of days to add the the current date time. But print getdate() + @Id , is not producing the updated result.But when ever i have replaced the variable "@Id" with a value, Say "5", it is producing the expected result.I have also tested the above code by the following:-

create table Temp(value datetime);
insert into Temp values(getdate() + @Id);
select * from Temp

But it is not having the new added datetime.