#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int arr[200005] = {0};
  long long int ans[200005] = {0};
  int x, y, n, k, q;
  cin >> n >> k >> q;
  while (n--) {
    cin >> x >> y;
    arr[x]++;
    arr[y + 1]--;
  }
  for (int i = 1; i <= 200000; i++) {
    arr[i] += arr[i - 1];
  }
  for (int i = 1; i <= 200000; i++) {
    if (arr[i] >= k)
      ans[i] = ans[i - 1] + 1;
    else
      ans[i] = ans[i - 1];
  }
  while (q--) {
    cin >> x >> y;
    cout << ans[y] - ans[x - 1] << endl;
  }
  return 0;
}
