package contest170908;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Comparator;
import java.util.InputMismatchException;

public class E {
	InputStream is;
	PrintWriter out;
	String INPUT = "";
	
	void solve()
	{
		// {i|xi+(ai>=sa)+(bi>=sa) >= 2} >= m
		// minimize {i|xi+(ai>=sa)+(bi>=sa) >= 3}
		int n = ni(), m = ni();
		int[][] ps = new int[n][];
		for(int i = 0;i < n;i++){
			ps[i] = new int[]{ni(), ni(), ni(), -1};
		}
		Arrays.sort(ps, new Comparator<int[]>() {
			public int compare(int[] a, int[] b) {
				return -(a[2] - b[2]);
			}
		});
		for(int i = 0;i < n;i++)ps[i][3] = i;
		int[] bs = new int[n];
		for(int i = 0;i < n;i++)bs[i] = -ps[i][2];
		int[] xs = new int[n];
		for(int i = 0;i < n;i++)xs[i] = ps[i][0];
		int[] ft1 = new int[n+3];
		int[] ft2 = new int[n+3];
		int[] ft3 = new int[n+3];
		int ge2 = 0;
		for(int i = 0;i < n;i++){
			if(xs[i] == 1){
				addFenwick(ft1, i, 1);
			}
			if(xs[i] == 2){
				addFenwick(ft2, i, 1);
			}
			if(xs[i] >= 3){
				addFenwick(ft3, i, 1);
			}
			if(xs[i] >= 2)ge2++;
		}
		
		Arrays.sort(ps, new Comparator<int[]>() {
			public int compare(int[] a, int[] b) {
				return -(a[1] - b[1]);
			}
		});
		
		int ans = n;
		{
			int need = m-ge2;
			if(need <= 0){
				ans = Math.min(ans, sumFenwick(ft3, n));
			}else{
				int over = firstGEFenwick(ft1, need);
				if(over < n){
					ans = Math.min(ans, sumFenwick(ft3, n) + sumFenwick(ft2, upperBound(bs, bs[over])));
				}
			}
		}
		for(int i = 0;i < n;){
			int j = i;
			while(j < n && ps[j][1] == ps[i][1])j++;
			
			for(int k = i;k < j;k++){
				int id = ps[k][3];
				xs[id]++;
				if(xs[id] == 1){
					addFenwick(ft1, id, 1);
				}
				if(xs[id] == 2){
					addFenwick(ft1, id, -1);
					addFenwick(ft2, id, 1);
					ge2++;
				}
				if(xs[id] == 3){
					addFenwick(ft2, id, -1);
					addFenwick(ft3, id, 1);
				}
			}
			int need = m-ge2;
			if(need <= 0){
				ans = Math.min(ans, sumFenwick(ft3, n));
			}else{
				int over = firstGEFenwick(ft1, need);
				if(over < n){
					ans = Math.min(ans, sumFenwick(ft3, n) + sumFenwick(ft2, upperBound(bs, bs[over])));
				}
			}
			i = j;
		}
		out.println(ans);
	}
	
	public static int upperBound(int[] a, int v){ return upperBound(a, 0, a.length, v); }
	public static int upperBound(int[] a, int l, int r, int v)
	{
		int low = l-1, high = r;
		while(high-low > 1){
			int h = high+low>>>1;
			if(a[h] <= v){
				low = h;
			}else{
				high = h;
			}
		}
		return low;
	}

	
	public static int[] restoreFenwick(int[] ft)
	{
		int n = ft.length-1;
		int[] ret = new int[n];
		for(int i = 0;i < n;i++)ret[i] = sumFenwick(ft, i);
		for(int i = n-1;i >= 1;i--)ret[i] -= ret[i-1];
		return ret;
	}

	
	public static int sumFenwick(int[] ft, int i)
	{
		int sum = 0;
		for(i++;i > 0;i -= i&-i)sum += ft[i];
		return sum;
	}
	
	public static void addFenwick(int[] ft, int i, int v)
	{
		if(v == 0 || i < 0)return;
		int n = ft.length;
		for(i++;i < n;i += i&-i)ft[i] += v;
	}
	
	public static int firstGEFenwick(int[] ft, int v)
	{
		int i = 0, n = ft.length;
		for(int b = Integer.highestOneBit(n);b != 0;b >>= 1){
			if((i|b) < n && ft[i|b] < v){
				i |= b;
				v -= ft[i];
			}
		}
		return i;
	}

	
	void run() throws Exception
	{
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);
		
		long s = System.currentTimeMillis();
		solve();
		out.flush();
		if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//		Thread t = new Thread(null, null, "~", Runtime.getRuntime().maxMemory()){
//			@Override
//			public void run() {
//				long s = System.currentTimeMillis();
//				solve();
//				out.flush();
//				if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//			}
//		};
//		t.start();
//		t.join();
	}
	
	public static void main(String[] args) throws Exception { new E().run(); }
	
	private byte[] inbuf = new byte[1024];
	public int lenbuf = 0, ptrbuf = 0;
	
	private int readByte()
	{
		if(lenbuf == -1)throw new InputMismatchException();
		if(ptrbuf >= lenbuf){
			ptrbuf = 0;
			try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
			if(lenbuf <= 0)return -1;
		}
		return inbuf[ptrbuf++];
	}
	
	private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
	private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
	
	private double nd() { return Double.parseDouble(ns()); }
	private char nc() { return (char)skip(); }
	
	private String ns()
	{
		int b = skip();
		StringBuilder sb = new StringBuilder();
		while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ')
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	
	private char[] ns(int n)
	{
		char[] buf = new char[n];
		int b = skip(), p = 0;
		while(p < n && !(isSpaceChar(b))){
			buf[p++] = (char)b;
			b = readByte();
		}
		return n == p ? buf : Arrays.copyOf(buf, p);
	}
	
	private int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private long[] nal(int n)
	{
		long[] a = new long[n];
		for(int i = 0;i < n;i++)a[i] = nl();
		return a;
	}
	
	private char[][] nm(int n, int m) {
		char[][] map = new char[n][];
		for(int i = 0;i < n;i++)map[i] = ns(m);
		return map;
	}
	
	private int[][] nmi(int n, int m) {
		int[][] map = new int[n][];
		for(int i = 0;i < n;i++)map[i] = na(m);
		return map;
	}
	
	private int ni() { return (int)nl(); }
	
	private long nl()
	{
		long num = 0;
		int b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
}