// yukicoder: 754 畳み込みの和
// 2019.5.13 bal4u

#include <stdio.h>

typedef long long ll;
#define M 1000000007

#if 1
#define gc() getchar_unlocked()
#else
#define gc() getchar()
#endif
int in()    // 非負整数の入力
{
	int n = 0, c = gc();
	do n = 10 * n + (c & 0xf), c = gc(); while (c >= '0');
	return n;
}

int a[100005], b[10005], sb[10005];

int main()
{
	int i, n, ans;

	n = in();
	for (i = 0; i <= n; i++) a[i] = in();
	sb[0] = 0; for (i = 0; i <= n; i++) {
		b[i] = in(), sb[i+1] = ((ll)sb[i] + b[i]) % M;
	}
	ans = 0; for (i = 0; i <= n; i++) {
		ans = (ans + (ll)a[i]*sb[n-i+1]) % M;
	}
	printf("%d\n", ans);
	return 0;
}