N=int(input())
a=[int(input()) for _ in range(N+1)]
b=[int(input()) for _ in range(N+1)]
c=[0]*(N+1)
for i in range(N+1):
    for j in range(N+1):
        if i+j>N:   break
        c[i+j]+=a[i]*b[j]
print(sum(c)%(1000000007))