#include <bits/stdc++.h>
using namespace std;
template <typename T>
struct binary_indexed_tree{
  int N;
  vector<T> BIT;
  binary_indexed_tree(int N): N(N), BIT(N + 1, 0){
  }
  void add(int i, T x){
    i++;
    while (i <= N){
      BIT[i] += x;
      i += i & -i;
    }
  }
  T sum(int i){
    T ans = 0;
    while (i > 0){
      ans += BIT[i];
      i -= i & -i;
    }
    return ans;
  }
  T sum(int L, int R){
    return sum(R) - sum(L);
  }
};
int main(){
  int N, K, Q;
  cin >> N >> K >> Q;
  vector<int> L(K), R(K), C(K), H(K);
  for (int i = 0; i < K; i++){
    cin >> L[i] >> R[i] >> C[i] >> H[i];
    L[i]--;
  }
  vector<int> I(Q), X(Q);
  for (int i = 0; i < Q; i++){
    cin >> I[i] >> X[i];
    I[i]--;
    X[i]--;
  }
  vector<vector<int>> add(N), sub(N + 1);
  for (int i = 0; i < K; i++){
    add[L[i]].push_back(i);
    sub[R[i]].push_back(i);
  }
  vector<vector<int>> query(N);
  for (int i = 0; i < Q; i++){
    query[I[i]].push_back(i);
  }
  binary_indexed_tree<long long> BIT(K);
  vector<int> ans(Q);
  for (int i = 0; i < N; i++){
    for (int j : add[i]){
      BIT.add(j, H[j]);
    }
    for (int j : sub[i]){
      BIT.add(j, -H[j]);
    }
    for (int j : query[i]){
      if (BIT.sum(0, K) < X[j]){
        ans[j] = -1;
      } else {
        int tv = K, fv = 0;
        while (tv - fv > 1){
          int mid = (tv + fv) / 2;
          if (BIT.sum(0, mid) > X[j]){
            tv = mid;
          } else {
            fv = mid;
          }
        }
        
        ans[j] = C[fv];
      }
    }
  }
  for (int i = 0; i < Q; i++){
    cout << ans[i] << endl;
  }
}