n = int(input())
a = [int(input()) for _ in range(n+1)]
b = [int(input()) for _ in range(n+1)]

mod = 10**9+7

at, abt = 0, 0

for i in range(n+1):
    at += a[i]
    abt += at * b[n-i]

print(abt % mod)