#include<cstdio>
#include<algorithm>
#include<iostream>
#include <iomanip>
const int MAXN=500000+5;
int a[MAXN],b[MAXN],n;long double ans;
int main()
{
	scanf("%d",&n);
	for(int i=1;i<=n;i++)
		scanf("%d",&a[i]);
	for(int i=1;i<=n;i++)
		scanf("%d",&b[i]);
	std::sort(a+1,a+n+1);
	std::sort(b+1,b+n+1);
	for(int i=n;i>=1;i--)
	{
		ans+=(double)a[i]*b[i];
		//printf("%d*%d=%.0lf\n",a[i],b[i],(double)a[i]*b[i]);
	}
	std::cout<<std::setiosflags(std::ios::fixed)<<std::setprecision(0)<<ans<<std::endl;
	return 0;
}