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];
			TreeSet<Integer>[] start=new TreeSet[n];;
			for(int i=0;i<n;i++) {
				dur[i]=in.nextInt();
				int c=in.nextInt();
				start[i]=new TreeSet<Integer>();
				for(int j=0;j<c;j++) {
					start[i].add(in.nextInt());
				}
			}
			int dp[]=new int[1<<n];
			for(int i=0;i<1<<n;i++) {
				for(int j=0;j<n;j++) {
					if((i& 1<<j)==0) {//movie not repeated
						if(start[j].contains(dp[i])) {//ends at start time
							dp[i|(1<<j)]=Math.max(dp[i|(1<<j)], dur[j]+dp[i]);
						}
						else if(start[j].lower(dp[i])!=null){
							dp[i|(1<<j)]=Math.max(dp[i|(1<<j)], dur[j]+start[j].lower(dp[i]));
						}
					}
				}
			}
			int ret=22;
			for(int i=0;i<dp.length;i++) {
				if(dp[i]>=l) {
					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