#include <bits/stdc++.h>   using namespace std;   ;   vector<pair<int, int>> vec;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int n, k, a, b, c;     c = 1;     cin >> n >> k;     for (int i = 0; i < n; i++) {       cin >> a >> b;       vec.push_back(make_pair(a * -1, b));     }     sort(vec.begin(), vec.end());     for (int i = 0; i < n; i++) {       if (i == k - 1) {         while (vec[i] == vec[i + 1]) {           i++;           c++;         }         cout << c <<   n ;         break;       }       if (vec[i] == vec[i + 1])         c++;       else         c = 1;     }     cout.flush();   }   