n=int(input())
a=list(map(int,input().split()))
b=list(map(int,input().split()))
f=[(a[i],b[i]) for i in range(n)]
f.sort()
B=sum(b)
c=0
for i in range(n):
	c+=f[i][1]
	if c>B//2:
		x=f[i][0]
		break
print(sum(b[i]*abs(x-a[i]) for i in range(n)))