import java.util.Scanner;

public class Test {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int num = sc.nextInt();
		long sum = 0, e = 1000000007, n, m;
		for(int i = 0; i < num; i++){
			n = (sc.nextLong()+1) % e;
			m = sc.nextLong() % e;
			sum += n*m;
			sum %= e;
		}
		System.out.println(sum);
	}
}