import java.util.*;

public class Main{

	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int ans = 0;
		
		for(int i=0; i<N; i++){
			int a = sc.nextInt();
			int b = sc.nextInt();
			
			double ab = a ^ b;
			ans +=ab;
		}
		
		System.out.println(ans%(1000000007));
	}
}