import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.PriorityQueue;
import java.util.Collection;
import java.util.AbstractQueue;
import java.io.IOException;
import java.util.Deque;
import java.util.ArrayList;
import java.io.UncheckedIOException;
import java.util.List;
import java.io.Closeable;
import java.io.Writer;
import java.io.OutputStreamWriter;
import java.util.ArrayDeque;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author daltao
 */
public class Main {
    public static void main(String[] args) throws Exception {
        Thread thread = new Thread(null, new TaskAdapter(), "daltao", 1 << 27);
        thread.start();
        thread.join();
    }

    static class TaskAdapter implements Runnable {
        @Override
        public void run() {
            InputStream inputStream = System.in;
            OutputStream outputStream = System.out;
            FastInput in = new FastInput(inputStream);
            FastOutput out = new FastOutput(outputStream);
            TaskB solver = new TaskB();
            solver.solve(1, in, out);
            out.close();
        }
    }

    static class TaskB {
        public void solve(int testNumber, FastInput in, FastOutput out) {
            int n = in.readInt();
            int m = in.readInt();
            int[][] lrs = new int[n][2];
            for (int i = 0; i < n; i++) {
                for (int j = 0; j < 2; j++) {
                    lrs[i][j] = in.readInt();
                }
            }
            Arrays.sort(lrs, (a, b) -> a[0] - b[0]);
            Deque<int[]> que = new ArrayDeque<>(Arrays.asList(lrs));
            List<int[]> remain = new ArrayList<>(n);
            while (!que.isEmpty() && que.peekFirst()[0] == 0) {
                remain.add(que.removeFirst());
            }
            PriorityQueue<int[]> leftSide = new PriorityQueue<>(n, (a, b) -> a[1] - b[1]);
            for (int i = 1; i <= m; i++) {
                if (que.isEmpty()) {
                    break;
                }
                leftSide.add(que.removeFirst());
                while (!que.isEmpty() && que.peekFirst()[0] == i) {
                    if (leftSide.peek()[1] < que.peekFirst()[1]) {
                        remain.add(leftSide.remove());
                        leftSide.add(que.removeFirst());
                    } else {
                        remain.add(que.removeFirst());
                    }
                }
            }

            int cnt = leftSide.size();
            remain.sort((a, b) -> -(a[1] - b[1]));
            int next = m;
            for (int[] lr : remain) {
                if (lr[1] > next) {
                    continue;
                }
                next--;
                cnt++;
            }

            cnt = Math.min(cnt, m);
            out.println(n - cnt);
        }

    }

    static class FastInput {
        private final InputStream is;
        private byte[] buf = new byte[1 << 13];
        private int bufLen;
        private int bufOffset;
        private int next;

        public FastInput(InputStream is) {
            this.is = is;
        }

        private int read() {
            while (bufLen == bufOffset) {
                bufOffset = 0;
                try {
                    bufLen = is.read(buf);
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
                if (bufLen == -1) {
                    return -1;
                }
            }
            return buf[bufOffset++];
        }

        public void skipBlank() {
            while (next >= 0 && next <= 32) {
                next = read();
            }
        }

        public int readInt() {
            int sign = 1;

            skipBlank();
            if (next == '+' || next == '-') {
                sign = next == '+' ? 1 : -1;
                next = read();
            }

            int val = 0;
            if (sign == 1) {
                while (next >= '0' && next <= '9') {
                    val = val * 10 + next - '0';
                    next = read();
                }
            } else {
                while (next >= '0' && next <= '9') {
                    val = val * 10 - next + '0';
                    next = read();
                }
            }

            return val;
        }

    }

    static class FastOutput implements AutoCloseable, Closeable {
        private StringBuilder cache = new StringBuilder(10 << 20);
        private final Writer os;

        public FastOutput(Writer os) {
            this.os = os;
        }

        public FastOutput(OutputStream os) {
            this(new OutputStreamWriter(os));
        }

        public FastOutput println(int c) {
            cache.append(c).append('\n');
            return this;
        }

        public FastOutput flush() {
            try {
                os.append(cache);
                cache.setLength(0);
            } catch (IOException e) {
                throw new UncheckedIOException(e);
            }
            return this;
        }

        public void close() {
            flush();
            try {
                os.close();
            } catch (IOException e) {
                throw new UncheckedIOException(e);
            }
        }

    }
}



Measured memory_bytes: 64036