Column Count Based On Conditon

Declare @ColumnName Nvarchar(40) , @Sql Nvarchar(1000),@ColumnCount Int, @I Int
Select @Sql='Select Id,Day1,Day2,Day3, ',@I=0,@ColumnCount=Count(COLUMN_NAME) 
From INFORMATION_SCHEMA.COLUMNS 
Where TABLE_NAME='Temp' and COLUMN_NAME Like 'Day%'

While @I<@ColumnCount 
Begin
     Select @ColumnName=COLUMN_NAME From INFORMATION_SCHEMA.COLUMNS 
     Where TABLE_NAME='Temp' 
     Order by COLUMN_NAME
	OFFSET @I Rows -- If Using Sqlserver 2012 use this else
	Fetch Next 1 Rows only; -- use Cursor or while loop with Top(1)
     Set @Sql= @Sql +' ' +'Case When '+ @ColumnName +' =''P'' Then 1 Else 0 End +'
     Set @I=@I+1
End
Set @Sql = Left(@Sql,len(@Sql)-1) +' as NoofDaysPresent From Temp'
Exec(@Sql)

Create Table Temp (Id Int, Day1 varchar(2),Day2 varchar(2),Day3 varchar(2))
Insert into Temp 
Select 1,'P','P','P' Union all
Select 2,'P','A','P' Union all
Select 3,'P','P','P' Union all
Select 4,'P','P','A' Union all
Select 5,'P','P','P' 

Id	Day1	Day2	Day3	NoofDaysPresent
----  ------   -----   -----    ---------------
1	P	P	P	3
2	P	A	P	2
3	P	P	P	3
4	P	P	A	2
5	P	P	P	3

Select Id,ColumnNames,Case When Day1='P' Then 1 Else 0 End+..... as NoofDaysPresent From TableName