import java.util.*;

public class Run {
    final static int M = 1000000007;
    public static void main (String arg[]) {
        Scanner scan = new Scanner(System.in);
        int N = scan.nextInt();
        String C, D;
        int c ,d;
        long ans = 0;
        for (int i = 0; i < N; i++) {
            c = d = 0;
            C = scan.next();
            D = scan.next();
            for (int j = 0; j < C.length(); j++) c = (c*10 + Integer.valueOf(C.substring(j, j+1))) % M;
            for (int j = 0; j < D.length(); j++) d = (d*10 + Integer.valueOf(D.substring(j, j+1))) % M;
            c = (c + 1)/2;
            ans += (c * d) % M;
        }
        System.out.println(ans);
    }
}