N = int(input())
A = list(map(int,input().split()))
B = list(map(int,input().split()))
l = []
for i in range(N):
    l.append((A[i],B[i]))
l.sort()
a = 0
for i in range(N):
    a += B[i]
a //= 2

now = 0
o = 0
for i in range(N):
    p,q = l[i]
    now += q
    if now >= a:
        o = p
        break

sum = 0
for i in range(N):
    sum += B[i] * abs(o-A[i])

print(sum)