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