source_code: import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.util.Arrays;
  import java.util.Comparator;
  
  public class ProblemA {
      public static class Team {
          int solved;
          int penalty;
          Team(int s, int p) {
              solved = s;
              penalty = p;
          }
      }
      
      public static void main(String[] args) throws IOException {
          BufferedReader s = new BufferedReader(new InputStreamReader(System.in));
          String[] data = s.readLine().split(" ");
          int n =  Integer.valueOf(data[0]);
          int k =  Integer.valueOf(data[1]);
  
          
          Team[] t = new Team[n];
          for (int i = 0 ; i < n ; i++) {
              String[] line = s.readLine().split(" ");
              t[i] = new Team(Integer.valueOf(line[0]), Integer.valueOf(line[1]));
          }
          Arrays.sort(t, new Comparator<Team>(){
              public int compare(Team arg0, Team arg1) {
                  if (arg0.solved != arg1.solved) {
                      return arg1.solved - arg0.solved;
                  }
                  return arg0.penalty - arg1.penalty;
              }
          });
          
          
          int idx = k - 1;
          int ksol = t[idx].solved;
          int kpen = t[idx].penalty;
          int count = 0;
          for (int i = 0 ; i < n ; i++) {
              if (t[i].solved == ksol && t[i].penalty == kpen) {
                  count++;
              }
          }
          System.out.println(count);
      }
  }