mod = 998244353


def main():
    import sys
    input = sys.stdin.buffer.readline

    class Bit:
        def __init__(self, n):
            self.size = n
            self.tree = [0] * (n + 1)

        def sum(self, i):
            s = 0
            while i > 0:
                s += self.tree[i]
                i -= i & -i
            return s

        def add(self, i, x):
            while i <= self.size:
                self.tree[i] += x
                i += i & -i

        def lower_bound(self, w):
            if w <= 0:
                return 0
            x = 0
            k = 1 << (self.size.bit_length() - 1)
            while k:
                if x + k <= self.size and self.tree[x + k] < w:
                    w -= self.tree[x + k]
                    x += k
                k >>= 1
            return x + 1

    N, K, Q = map(int, input().split())
    ope = []
    for _ in range(K):
        ope.append(tuple(map(int, input().split())))

    query = []
    for _ in range(Q):
        query.append(tuple(map(int, input().split())))

    OK = [K] * Q
    NG = [-1] * Q
    for _ in range(K.bit_length()):
        MID = [(ok + ng) // 2 for ok, ng in zip(OK, NG)]
        T = [[] for _ in range(K+1)]
        for i, t in enumerate(MID):
            T[t].append(i)

        bit = Bit(N+1)
        for k in range(K):
            l, r, c, h = ope[k]
            bit.add(l, h)
            if r != N:
                bit.add(r + 1, -h)
            for i in T[k]:
                j, x = query[i]
                hh = bit.sum(j)
                if x <= hh:
                    OK[i] = MID[i]
                else:
                    NG[i] = MID[i]

    for i in range(Q):
        k = OK[i]
        if k < K:
            _, _, c, _ = ope[k]
            print(c)
        else:
            print(-1)


if __name__ == '__main__':
    main()