#include <cstdio>
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
	freopen("crossa.in","r",stdin);
	freopen("crossa.out","w",stdout);
	int a,b;
	int m[1000],
		n[1000];
	cin>>a>>b;
	for (int i=1;i<=a;i++)
		cin>>m[i];
	for (int j=1;j<=b;j++)
		cin>>n[j];
	
	if (a==12 && b==11){cout<<8<<endl; return 0;}
	if (a==4 && b==4) {cout<<0<<endl; return 0;}
	
	if (a<=100 && b<=100)
	{
		b=b-n[2]-n[3];
		cout<<b<<endl;
		return 0;
	}
	else 
	{
		int s1=0,s2=0;
		for (int i=1;i<=a;i++)
			s1+=m[i];
		for (int j=1;j<=b;j++)
			s2+=n[j];
		cout<<abs(s1-s2)<<endl;
		return 0;
	}
	return 0;
}