import java.util.*;
import java.io.*;
class Main
{
    public static void main(String args[])throws IOException
    {
        Reader in = new Reader();
        int r = in.nextInt();
        int c = in.nextInt();
        int m = in.nextInt();
        ArrayList<Integer>[] adj = new ArrayList[r];
        for (int i=0;i<r;i++)
            adj[i]= new ArrayList<>();
        MultiOrderedSet h = new MultiOrderedSet();
        long[] C = new long[c];
        for (int i=0;i<m;i++)
        {
            int x = in.nextInt() - 1;
            int y = in.nextInt() - 1;
            adj[x].add(y);
            C[y]++;
        }
        for (int i=0;i<c;i++)
        {
            h.insert(C[i]);
        }
        long ans = 0L;
        for (int i=0;i<r;i++)
        {
            ans = Math.max(ans, adj[i].size() + h.largest() - 1L);
            for (int j: adj[i])
            {
                h.remove(C[j]);
            }
            if (h.h.size() > 0)
            {
                ans = Math.max(ans, adj[i].size() + h.largest());
            }
            for (int j: adj[i])
            {
                h.insert(C[j]);
            }
        }
        System.out.println(ans);

    }
}
class Reader
{
    final private int BUFFER_SIZE = 1 << 16;
    private DataInputStream din;
    private byte[] buffer;
    private int bufferPointer, bytesRead;

    public Reader()
    {
        din = new DataInputStream(System.in);
        buffer = new byte[BUFFER_SIZE];
        bufferPointer = bytesRead = 0;
    }

    public Reader(String file_name) throws IOException
    {
        din = new DataInputStream(new FileInputStream(file_name));
        buffer = new byte[BUFFER_SIZE];
        bufferPointer = bytesRead = 0;
    }

    public String readLine() throws IOException
    {
        byte[] buf = new byte[64]; // line length
        int cnt = 0, c;
        while ((c = read()) != -1)
        {
            if (c == '\n')
                break;
            buf[cnt++] = (byte) c;
        }
        return new String(buf, 0, cnt);
    }

    public int nextInt() throws IOException
    {
        int ret = 0;
        byte c = read();
        while (c <= ' ')
            c = read();
        boolean neg = (c == '-');
        if (neg)
            c = read();
        do
        {
            ret = ret * 10 + c - '0';
        }  while ((c = read()) >= '0' && c <= '9');

        if (neg)
            return -ret;
        return ret;
    }

    public long nextLong() throws IOException
    {
        long ret = 0;
        byte c = read();
        while (c <= ' ')
            c = read();
        boolean neg = (c == '-');
        if (neg)
            c = read();
        do {
            ret = ret * 10 + c - '0';
        }
        while ((c = read()) >= '0' && c <= '9');
        if (neg)
            return -ret;
        return ret;
    }

    public double nextDouble() throws IOException
    {
        double ret = 0, div = 1;
        byte c = read();
        while (c <= ' ')
            c = read();
        boolean neg = (c == '-');
        if (neg)
            c = read();

        do {
            ret = ret * 10 + c - '0';
        }
        while ((c = read()) >= '0' && c <= '9');

        if (c == '.')
        {
            while ((c = read()) >= '0' && c <= '9')
            {
                ret += (c - '0') / (div *= 10);
            }
        }

        if (neg)
            return -ret;
        return ret;
    }

    private void fillBuffer() throws IOException
    {
        bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
        if (bytesRead == -1)
            buffer[0] = -1;
    }

    private byte read() throws IOException
    {
        if (bufferPointer == bytesRead)
            fillBuffer();
        return buffer[bufferPointer++];
    }

    public void close() throws IOException
    {
        if (din == null)
            return;
        din.close();
    }
}
class MultiOrderedSet
{
    TreeMap<Long, Integer> h = new TreeMap<>();

    public void insert(long v)
    {
        h.put(v, h.getOrDefault(v, 0) + 1);
    }
    public void remove(long v)
    {
        h.put(v, h.get(v) - 1);
        if (h.get(v) == 0)
            h.remove(v);
    }
    public long largest()
    {
        return h.lastKey();
    }
}


Measured memory_bytes: 90352