#include<bits/stdc++.h>
#include<atcoder/fenwicktree>
using namespace std;
using namespace atcoder;

void solve(){    
    int n, k, q;
    cin >> n >> k >> q;
    vector<int> L(k), R(k), C(k), I(q);
    vector<long long> H(k), X(q);
    for(int i = 0; i < k; i++){
        cin >> L[i] >> R[i] >> C[i] >> H[i];
    }
    for(int i = 0; i < q; i++){
        cin >> I[i] >> X[i];
    }

    fenwick_tree<long long> bit(n + 1);
    for(int i = 0; i < k; i++){
        bit.add(L[i] - 1, H[i]);
        bit.add(R[i], -H[i]);
    }

    vector<int> ans(q);
    vector<int> LL, RR;
    vector<vector<int>> ind(1, vector<int>());
    LL.push_back(0);
    RR.push_back(k);
    for(int i = 0; i < q; i++){
        long long h = bit.sum(0, I[i]);
        if(h < X[i]) ans[i] = -1;
        else ind[0].push_back(i);
    }
    while(!ind.empty()){
        vector<int> nLL, nRR;
        vector<vector<int>> nind;
        int bj = 0;
        int size = ind.size();
        fenwick_tree<long long> bit(n + 1);
        for(int i = 0; i < size; i++){
            if(RR[i] - LL[i] <= 1){
                for(auto j:ind[i]){
                    ans[j] = C[RR[i] - 1];
                }
                continue;
            }
            int mid = (LL[i] + RR[i]) / 2;
            for(int j = bj; j < mid; j++){
                bit.add(L[j] - 1, H[j]);
                bit.add(R[j], -H[j]);
            }
            vector<int> bef, aft;
            for(auto j:ind[i]){
                long long h = bit.sum(0, I[j]);
                if(h < X[j]) aft.push_back(j);
                else bef.push_back(j);
            }
            if(!bef.empty()){
                nLL.push_back(LL[i]);
                nRR.push_back(mid);
                nind.push_back(bef);
            }
            if(!aft.empty()){
                nLL.push_back(mid);
                nRR.push_back(RR[i]);
                nind.push_back(aft);
            }
            bj = mid;
        }

        LL = nLL;
        RR = nRR;
        ind = nind;
    }
    for(auto a:ans){
        cout << a << "\n";
    }




}

int main(){
    cin.tie(0)->sync_with_stdio(0);
    int t;
    t = 1;
    // cin >> t;
    while(t--) solve();
}