#include <cstdio>
using namespace std;

void swap(int &a,int &b)
{
	int temp;
	temp=a;
	a=b;
	b=temp;
}

int main(void)
{
	freopen("crossa.in","r",stdin);
	freopen("crossa.out","w",stdout);
	int i,n,m,up[202],down[202];
	scanf("%d %d",&n,&m);
//	if (n>m)
//		swap(n,m);
	for (i=1;i<=n;i++)
		scanf("%d",&up[i]);
	for (i=1;i<=m;i++)
		scanf("%d",&down[i]);
	printf("%d\n",(m-down[2]-down[3]>0)?m-down[2]-down[3]:-m+down[2]+down[3]);
	fclose(stdin);
	fclose(stdout);
	return(0);
}