#include <bits/stdc++.h>
#define ll long long
#define INF 100000000000000000
#define forni for (int i=0;i<n;i++)
#define fornj for (int j=0;j<n;j++)
using namespace std;
 
int n,m,b[5002],c[5002];
ll int dp[5002][5002];
 
ll int func(){
	for (int i=n;i>=1;i--){
		for (int k=m-n+i;k>=i;k--){
			dp[i][k]=INF;
			for (int j=k;j<=m-n+i;j++){
				dp[i][k] = min(dp[i][k],abs(b[i]-c[j])+dp[i+1][k+1]);
			}
		}
	}
	cout << dp[1][1];
	return 0;
}
 
int main(){
	scanf("%d%d",&n,&m);
	for (int i=1;i<=n;i++) scanf("%d",&b[i]);
	for (int i=1;i<=m;i++) scanf("%d",&c[i]);
	sort(b,b+n+1);
	sort(c,c+m+1);
	func();
	return 0;
}
 

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MiAyCjkgMQoxMCA1

2 2
9 1
10 5