import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.NoSuchElementException;

public class Main {
    public static void main(String[] args) {
        new Main().solve();
    }

    public void solve() {
        Scanner sc = new Scanner();
        int N = sc.nextInt();
        int M = sc.nextInt();
        int Q = sc.nextInt();
        int[][] cnt = new int[N][N];
        for (int i = 0; i < M; i++) {
            int l = sc.nextInt() - 1;
            int r = sc.nextInt() - 1;
            cnt[l][r]++;
        }
        for (int i = N - 2; i >= 0; i--)
            for (int j = 0; j < N; j++)
                cnt[i][j] += cnt[i + 1][j];
        for (int i = 1; i < N; i++)
            for (int j = 0; j < N; j++)
                cnt[j][i] += cnt[j][i - 1];
        PrintWriter pw = new PrintWriter(System.out);
        for (int i = 0; i < Q; i++) {
            int p = sc.nextInt() - 1;
            int q = sc.nextInt() - 1;
            pw.println(cnt[p][q]);
        }
        pw.close();
    }

    class Scanner {
        private final InputStream in = System.in;
        private final byte[] buffer = new byte[1024];
        private int ptr = 0;
        private int buflen = 0;

        private boolean hasNextByte() {
            if (ptr < buflen) {
                return true;
            } else {
                ptr = 0;
                try {
                    buflen = in.read(buffer);
                } catch (IOException e) {
                    e.printStackTrace();
                }
                if (buflen <= 0) {
                    return false;
                }
            }
            return true;
        }

        private int readByte() {
            if (hasNextByte())
                return buffer[ptr++];
            else
                return -1;
        }

        private boolean isPrintableChar(int c) {
            return 33 <= c && c <= 126;
        }

        public boolean hasNext() {
            while (hasNextByte() && !isPrintableChar(buffer[ptr]))
                ptr++;
            return hasNextByte();
        }

        public String next() {
            if (!hasNext())
                throw new NoSuchElementException();
            StringBuilder sb = new StringBuilder();
            int b = readByte();
            while (isPrintableChar(b)) {
                sb.appendCodePoint(b);
                b = readByte();
            }
            return sb.toString();
        }

        public long nextLong() {
            if (!hasNext())
                throw new NoSuchElementException();
            long n = 0;
            boolean minus = false;
            int b = readByte();
            if (b == '-') {
                minus = true;
                b = readByte();
            }
            if (b < '0' || '9' < b) {
                throw new NumberFormatException();
            }
            while (true) {
                if ('0' <= b && b <= '9') {
                    n *= 10;
                    n += b - '0';
                } else if (b == -1 || !isPrintableChar(b)) {
                    return minus ? -n : n;
                } else {
                    throw new NumberFormatException();
                }
                b = readByte();
            }
        }

        public int nextInt() {
            long nl = nextLong();
            if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
                throw new NumberFormatException();
            return (int) nl;
        }

        public double nextDouble() {
            return Double.parseDouble(next());
        }
    }
}

Measured memory_bytes: 32216