mod=(10**9)+7
N=int(input())
A=list()
B=list()
for i in range(N+1):
    a=int(input())
    A.append(a)
for i in range(N+1):
    a=int(input())
    if i!=0:
        B.append((B[i-1]+a)%mod)
    else:
        B.append(a%mod)
B=list(reversed(B))
s=0
for i in range(N+1):
    s+=(A[i]*B[i])%mod
print(s%mod)