import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		new Main().run();
	}

	long MOD = 1_000_000_000 + 7;

	void run() {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		long[] a = new long[n + 1];
		long[] b = new long[n + 1];
		for (int i = 0; i < a.length; ++i) {
			a[i] = sc.nextLong();
		}
		for (int i = 0; i < b.length; ++i) {
			b[i] = sc.nextLong();
		}
		long ans = 0;
		long tmp = 0;
		for (int i = n; i >= 0; --i) {
			tmp = (tmp + b[n - i]) % MOD;
			ans = (ans + a[i] * tmp % MOD) % MOD;
		}
		System.out.println(ans);
	}

	static void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}
}