#include < stdio.h >

#include<Conio.h>

{

int n, i , s =0 ;

printf(“Enter the value of n “);

Scan f (“%d”, & n ) ;

for (i =1 ;i <n ; i +=1)

{

S= S + i ^ (i+1);

}

Printf (“Sum=%d” ,S);

Getch();

}