/* First Page and Last Page*/
	 if(p==n || p==1){
       return 0;
   }else if(p==1 && n%2==0){
	 // First Page only
       return 0;
   }
   else if(p==n-1 && n%2==0){
	 //Last Page only
       return 1;
   }else{
	 // In between pages
       let count=0;
       if(p<=n/2){
			     // page less than mid page
           // search from left
           let i=1;
           let count=0
           while(i<=p){
               if(i!=p)count++;
               i+=2;
               
           }
           return count;
       }else{
			     // page greater than mid page
           //search from right.
           let j=n-1;
           let count=0;
           while(p<=j){
               if(p!=j)count++;
               j-=2;
           }
           return count;
       }
   }