#include<stdio.h>
int n,m,c[1024],l,s1[1024],s2[1024],r,c1[1024],c2[1024];
void citire()
{
	int i;
	scanf("%d",&l);
	for(i=0;i<l;i++)
		scanf("%d",&s1[i]);
	for(i=0;i<l;i++)
		scanf("%d",&s2[i]);
	scanf("%d",&r);
}
int maxim(int s1[],int s2[])
{
	int max=s1[0],i;
	for(i=0;i<1024;i++)
		if(s1[i]>max)
			max=s1[i];
	for(i=0;i<1024;i++)
		if(s2[i]>max)
			max=s2[i];
	return max;
}
int main()
{
	freopen("balanta.in","r",stdin);
	freopen("balanta.out","w",stdout);
	int max,j,i;
	scanf("%d%d",&n,&m);
	for(i=0;i<m;i++)
	{
		citire();
		if(r==1)
			for(j=0;j<l;j++)
				c1[j]=1;
		if(r==2)
			for(j=0;j<=2*l;j++)
				c2[j]=2;
	}
	max=maxim(s1,s2);
	printf("%d\n",max);
	return 0;
}