n = int(input())
a = [0] * (n+1)
for i in range(n+1):
    a[i] = int(input())
b = [0] * (n+1)
for i in range(n+1):
    b[i] = int(input())
p = 10 ** 9 + 7
s = [0] * (n+1)
s[0] = b[0]
for i in range(1,n+1):
    s[i] = s[i-1] + b[i]
    s[i] %= p
ans = 0
for i in range(n+1):
    ans += a[i]*s[n-i]
    ans %= p
print(ans)