source_code: import java.io.BufferedReader;
  import java.io.InputStreamReader;
  import java.io.PrintWriter;
  import java.util.Arrays;
  import java.util.StringTokenizer;
  
  public class Solution {
      static class Team implements Comparable<Team> {
          int pr;
          int time;
          int id;
  
          public Team(int P, int T, int I) {
              pr = P;
              time = T;
              id = I;
          }
  
          @Override
          public int compareTo(Team t) {
              return pr != t.pr ? t.pr - pr : time != t.time ? time - t.time : id - t.id;
          }
  
      }
  
      public static void main(String[] args) throws Exception {
          BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
          PrintWriter out = new PrintWriter(System.out);
  
          StringTokenizer st = new StringTokenizer(in.readLine());
          int n = Integer.parseInt(st.nextToken());
  
          int k = Integer.parseInt(st.nextToken());
  
          Team[] a = new Team[n];
          int[] c = new int[n + 1];
  
          for (int i = 0; i < n; i++) {
              st = new StringTokenizer(in.readLine());
              int p = Integer.parseInt(st.nextToken());
              int t = Integer.parseInt(st.nextToken());
  
              a[i] = new Team(p, t, i);
          }
  
          Arrays.sort(a);
          int prev = 1;
          c[1]++;
  
          for (int i = 1; i < n; i++) {
              if (a[i].pr == a[i - 1].pr && a[i].time == a[i - 1].time)
                  for (int j = i + 1; j >= prev; j--)
                      c[j] = i + 2 - prev;
              else {
                  prev = i + 1;
                  c[prev] = 1;
              }
          }
  
          out.println(c[k]);
          out.close();
      }
  }
  