N=int(input())
A=list(map(int,input().split()))
B=list(map(int,input().split()))
L=[]
x=1
ans=0
for i in range(N):
    L.append([A[i],B[i]])
for i in range(N):
    C=[]
    for i in range(N):
        if(A[i]<=1):
            C.append(i)
    CB=[]
    for i in range(len(C)):
        CB.append(B[i])
    IND=B.index(max(B[i]))
    ans+=A[IND]*x
    x=B[IND]*x
    A.pop(IND)
    B.pop(IND)
print(ans%(10*9+7))