#include <bits/stdc++.h>
using namespace std;
using ll = long long int;

#define REP(i, n) FOR(i, 0, n)
#define FOR(i, s, n) for (int i = (s), i##_len = (n); i < i##_len; ++i)

#define isvisiblechar(c) (0x21 <= (c) && (c) <= 0x7E)
#define cin scanner
#define cout printer
namespace {
class MaiScanner {
  public:
    template <typename T> void input_integer(T &var) {
        var = 0;
        T sign = 1;
        int cc = getchar_unlocked();
        for (; cc < '0' || '9' < cc; cc = getchar_unlocked())
            if (cc == '-')
                sign = -1;
        for (; '0' <= cc && cc <= '9'; cc = getchar_unlocked())
            var = (var << 3) + (var << 1) + cc - '0';
        var = var * sign;
    }
    inline int c() { return getchar_unlocked(); }
    inline MaiScanner &operator>>(int &var) {
        input_integer<int>(var);
        return *this;
    }
    inline MaiScanner &operator>>(long long &var) {
        input_integer<long long>(var);
        return *this;
    }
    inline MaiScanner &operator>>(string &var) {
        int cc = getchar_unlocked();
        for (; !isvisiblechar(cc); cc = getchar_unlocked())
            ;
        for (; isvisiblechar(cc); cc = getchar_unlocked())
            var.push_back(cc);
        return *this;
    }
    template <typename IT> void in(IT begin, IT end) {
        for (auto it = begin; it != end; ++it)
            *this >> *it;
    }
};
class MaiPrinter {
  public:
    template <typename T> void output_integer(T var) {
        if (var == 0) {
            putchar_unlocked('0');
            return;
        }
        if (var < 0)
            putchar_unlocked('-'), var = -var;
        char stack[32];
        int stack_p = 0;
        while (var)
            stack[stack_p++] = '0' + (var % 10), var /= 10;
        while (stack_p)
            putchar_unlocked(stack[--stack_p]);
    }
    inline MaiPrinter &operator<<(char c) {
        putchar_unlocked(c);
        return *this;
    }
    inline MaiPrinter &operator<<(int var) {
        output_integer<int>(var);
        return *this;
    }
    inline MaiPrinter &operator<<(long long var) {
        output_integer<long long>(var);
        return *this;
    }
    inline MaiPrinter &operator<<(char *str_p) {
        while (*str_p)
            putchar_unlocked(*(str_p++));
        return *this;
    }
    inline MaiPrinter &operator<<(const string &str) {
        const char *p = str.c_str();
        const char *l = p + str.size();
        while (p < l)
            putchar_unlocked(*p++);
        return *this;
    }
    template <typename IT> void join(IT begin, IT end, char sep = ' ') {
        for (bool b = 0; begin != end; ++begin, b = 1)
            b ? *this << sep << *begin : *this << *begin;
    }
};
} // namespace
MaiScanner scanner;
MaiPrinter printer;

//
// Binary Indexed Tree 2D
//
// verified:
//   AOJ 2842 たい焼きマスターと食べ盛り
//     http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=2842
//
template <class Abel> struct BIT2D {
    const Abel UNITY_SUM = 0; // to be set
    vector<vector<Abel>> dat;

    BIT2D(int n = 1, int m = 1) : dat(n + 1, vector<Abel>(m + 1, UNITY_SUM)) {}
    void init(int n, int m) {
        dat.assign(n + 1, vector<Abel>(m + 1, UNITY_SUM));
    }

    /* add x on the point (a, b) */
    inline void add(int a, int b, Abel x) {
        for (int i = a; i < (int)dat.size(); i += i & -i)
            for (int j = b; j < (int)dat[0].size(); j += j & -j)
                dat[i][j] = dat[i][j] + x;
    }

    inline Abel sum(int p, int q) {
        Abel res = UNITY_SUM;
        for (int i = p; i > 0; i -= i & -i)
            for (int j = q; j > 0; j -= j & -j)
                res = res + dat[i][j];
        return res;
    }

    /* a1 <= x < b1, a2 <= y < b2, 1-indexd */
    inline Abel sum(int a1, int a2, int b1, int b2) {
        return sum(b1 - 1, b2 - 1) - sum(a1 - 1, b2 - 1) - sum(b1 - 1, a2 - 1) +
               sum(a1 - 1, a2 - 1);
    }

    /* debug */
    void print() {
        for (int i = 1; i < (int)dat.size(); ++i) {
            for (int j = 1; j < (int)dat[0].size(); ++j)
                cout << sum(i, j, i + 1, j + 1) << ",";
            cout << "¥n";
        }
    }
};

int main(void) {
    int N, M, Q;
    cin >> N >> M >> Q;
    BIT2D<int> bt(N, N);
    REP(i, M) {
        int l, r;
        cin >> l >> r;
        bt.add(l, r, 1);
    }
    REP(i, Q) {
        int p, q;
        cin >> p >> q;
        cout << bt.sum(p, p, q + 1, q + 1) << "\n";
    }

    return 0;
}


Measured memory_bytes: 1920