/*
ID: vvatash1
PROG: numtri
LANG: C++
*/
using namespace std;
#include <algorithm>
#include <numeric>
#include <iostream>
#include <sstream>
#include <string>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <cstdio>
#include <cstdlib>
#include <cctype>
#include <cassert>
#include <cmath>
#include <math.h>
#include <complex>
#include <stack>
#include <iostream>
#include <fstream>
#include <vector>
#include <fstream>

float roundf(float x)
{
   return x >= 0.0f ? floorf(x + 0.5f) : ceilf(x - 0.5f);
}

int compare_ints(const void* a, const void* b)
{
    int arg1 = *(const int*)a;
    int arg2 = *(const int*)b;
 
    if (arg1 > arg2) return -1;
    if (arg1 < arg2) return 1;
    return 0;
}


int main()
{
	ifstream fin ("toys.in");
	ofstream fout ("toys.out");
	int numberChoosen = 0, numberInStore = 0;	
	int toysPrice[6000]={0};
	int toysChoosen[6000]={0};


	fin >> numberChoosen >> numberInStore;

	for (int i = 0; i < numberChoosen; i++)			
		fin >> toysChoosen[i];
	
	for (int i = 0; i < numberInStore; i++)			
		fin >> toysPrice[i];

	qsort(toysChoosen, numberChoosen, sizeof(int), compare_ints);
	qsort(toysPrice, numberInStore, sizeof(int), compare_ints);

	int result = 0;
	for (int i = 0; i < numberChoosen; i++)
	{
		result += toysChoosen[i] * toysPrice[i];

		cout << toysChoosen[i] * toysPrice[i] << "    " <<endl;
	}

	fout << result << "\n";
	fout.close();
}