import java.io.*;
import java.util.*;

class Main
{
    public static void main(String args[])throws Exception
    {
        BufferedReader bu=new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb=new StringBuilder();
        String s[]=bu.readLine().split(" ");
        int n=Integer.parseInt(s[0]),k=Integer.parseInt(s[1]);

        int i,b[]=new int[n];
        long dp[][]=new long[n][2],ans=0;
        for(i=0;i<n;i++)
        {
            s=bu.readLine().split(" ");
            int c=Integer.parseInt(s[0]),m=Integer.parseInt(s[1]);
            if(i>0)
            {
                dp[i][0]=dp[i-1][0];    //0 means no coin bought to store
                dp[i][1]=dp[i-1][0]-c;  //1 means coin bought to store
            }
            else dp[i][1]=-c;

            int j,x;
            s=bu.readLine().split(" ");
            for(j=0;j<m;j++)
            {
                x=Integer.parseInt(s[j])-1;
                dp[i][0]=Math.max(dp[x][1]+c,dp[i][0]);
            }

            ans=Math.max(ans,dp[i][0]);
            ans=Math.max(ans,dp[i][1]);
            //System.out.println(dp[i][0]+" "+dp[i][1]);
        }
        System.out.println(ans);
    }
}