#yuki754

n=int(raw_input())
a=[]
for i in xrange(n+1):
 a.append(int(raw_input()))
b=[]
for i in xrange(n+1):
 b.append(int(raw_input()))

suma=sum(a)
res=0
for i in xrange(n,-1,-1):
 res=(res+suma*b[n-i])%(10**9+7)
 suma-=a[i]
print res