import java.util.*;
import java.io.*;
import java.io.BufferedReader;
import java.awt.Point;

public class movie{
	public static final String TASKNAME = "movie";
	public static long mod= 1000000007;
	public static Debug db;

	public static void main(String[] args) throws IOException {
//		InputReader in = new InputReader(System.in);
//		PrintWriter out = new PrintWriter(System.out);
		InputReader in = new InputReader(new FileInputStream(TASKNAME+".in"));
		PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter(TASKNAME+".out")));
		Autocompletion solver = new Autocompletion();
		db=new Debug(System.getSecurityManager()==null);
		solver.solve(1, in, out);
		out.close();
	}
	static class Autocompletion {

		public void solve(int testNumber, InputReader in, PrintWriter out) {
			int n=in.nextInt();
			int l=in.nextInt();
			int dur[]=new int[n];
			ArrayList<Pair> arr=new ArrayList<Pair>();//index by order
			for(int i=0;i<n;i++) {
				int d=in.nextInt();
				dur[i]=d;
				int c=in.nextInt();
				for(int j=0;j<c;j++) {
					int temp=in.nextInt();
					arr.add(new Pair(temp,i));
				}
			}
			Collections.sort(arr);
			ArrayList<Integer> adj[]=new ArrayList[arr.size()];
			for(int i=0;i<arr.size();i++)adj[i]=new ArrayList<Integer>();
			for(int i=0;i<arr.size();i++) {
				for(int j=i+1;j<arr.size();j++) {
					if(arr.get(i).x+dur[arr.get(i).y]>=arr.get(j).x) {
						adj[i].add(j);
					}
					else {
						break;
					}
				}
			}
			int dp[]=new int[1<<n];
			Arrays.fill(dp, -1);
			dp[0]=0;
			ArrayDeque<Pair> dq=new ArrayDeque<Pair>();
			for(int i=0;i<arr.size();i++) {
				if(arr.get(i).x==0) {
					dq.add(new Pair(i,1<<arr.get(i).y));
					dp[1<<arr.get(i).y]=dur[arr.get(i).y];
				}
				else {
					break;
				}
			}
			while(!dq.isEmpty()) {
				Pair x=dq.remove();
				for(int y:adj[x.x]) {
					int newSet=(1<<arr.get(y).y | x.y);
					if((1<<arr.get(y).y & x.y)==0) {//no movies in common
						if(arr.get(y).x+dur[arr.get(y).y]>dp[newSet]) {//better
							dp[newSet]=arr.get(y).x+dur[arr.get(y).y];
							dq.add(new Pair(y,newSet));
						}
					}
				}
			}
			int ret=22;
			for(int i=0;i<dp.length;i++) {
				if(dp[i]>=l) {
//					System.out.println(i);
					ret=Math.min(ret, Integer.bitCount(i));
				}
			}
			if(ret==22) {
				out.println(-1);
			}
			else {
				out.println(ret);
			}
		}
	}
	static class Pair implements Comparable<Pair>{
		int x;
		int y;
		Pair(int a, int b){
			x=a;
			y=b;
		}
		@Override
		public int compareTo(Pair arg0) {
			if(arg0.x!=x)return x-arg0.x;
			return y-arg0.y;
		}
	}
	static class Triple implements Comparable<Triple>{
		int x;
		int y;
		int z;
		Triple(int a, int b, int c){
			x=a;
			y=b;
			z=c;
		}
		@Override
		public int compareTo(Triple arg0) {
			if(arg0.x!=x)return x-arg0.x;
			return y-arg0.y;
		}
	}

	static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public int nextInt() {
            return Integer.parseInt(next());
        }
        public long nextLong() {
        	return Long.parseLong(next());
        }
        public int[] nextIntArr(int n) {
        	int arr[]=new int[n];
        	for(int i=0;i<n;i++) {
        		arr[i]=this.nextInt();
        	}
        	return arr;
        }
    }
	public static class Debug {
        private boolean allowDebug;

        public Debug(boolean allowDebug) {
            this.allowDebug = allowDebug;
        }

        private void outputName(String name) {
            System.out.print(name + " = ");
        }

        public void debug(String name, int x) {
            if (!allowDebug) {
                return;
            }

            outputName(name);
            System.out.println("" + x);
        }

        public void debug(String name, long x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println("" + x);
        }

        public void debug(String name, double x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println("" + x);
        }

        public void debug(String name, int[] x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println(Arrays.toString(x));
        }

        public void debug(String name, long[] x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println(Arrays.toString(x));
        }

        public void debug(String name, double[] x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println(Arrays.toString(x));
        }

        public void debug(String name, Object x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println("" + x);
        }

        public void debug(String name, Object... x) {
            if (!allowDebug) {
                return;
            }
            outputName(name);
            System.out.println(Arrays.deepToString(x));
        }
    }
}

//equal :problem