#BIT plus ver
class BITplus:
    def __init__(self,N):
        self.N = N
        self.bit = [0] * (self.N+1)
    def add(self,i,x):
        while i <= self.N:
            self.bit[i] += x
            i += i & -i
    def fold(self,i):
        ans = 0
        while i > 0:
            ans += self.bit[i]
            i -= i & -i
        return ans
    def lb(self,w):
        if w <= 0:return 0
        x = 0
        k = 1
        while k <= self.N:
            k <<= 1
        k >>= 1
        while k:
            if x + k <= self.N and self.bit[x+k] < w:
                w -= self.bit[x+k]
                x += k
            k >>= 1
        return x + 1

    #サイズ N の配列をいれる
    def build(self,seq):
        bit = self.bit
        N = self.N
        for i in range(N):
            bit[i+1] = seq[i]
        for i in range(1,N+1):
            if i + (i & -1) <= N:
                bit[i + (i & -i)] += bit[i]

import sys
rr = sys.stdin
N,K,Q = map(int,rr.readline().split())
sousa = [[] for _ in range(N + 2)]
col = []
for _ in range(K):
    l,r,c,h = map(int,rr.readline().split())
    sousa[l].append((_,h))
    sousa[r + 1].append((_,-h))
    col.append(c)
bit = BITplus(K)
query = []
for _ in range(Q):
    i,x = map(int,input().split())
    query.append((i,x,_))
query.sort(key = lambda x:x[0])
ans = [0] * Q
now = 0
for i,x,_ in query:
    while now <= i:
        for q,d in sousa[now]:
            bit.add(q + 1,d)
        now += 1
    tmp = bit.fold(K)
    #print(tmp)
    if tmp < x:
        ans[_] = -1
        continue
    t = bit.lb(x)
    ans[_] = col[t - 1]
print(*ans,sep = "\n")