/*
    Author: Anthony Ngene
    Created: 22/08/2020 - 13:23
*/

import java.io.*;
import java.util.*;

public class Main {
    // Always forgive your enemies; nothing annoys them so much. - Oscar Wilde
    public static void main(String[] args) throws IOException {
        in = new FastScanner();

        int rLen = in.intNext(), cLen = in.intNext(), t = in.intNext();
        HashSet<Tuple> targets = new HashSet<>();
        int[] cols = new int[cLen + 1];
        int[] rows = new int[rLen + 1];
        int bestRow = 1;
        int bestCol = 1;
        for (int i = 0; i < t; i++) {
            int r = in.intNext(), c = in.intNext();
            targets.add(new Tuple(r, c));
            rows[r] += 1;
            cols[c] += 1;
            if (rows[r] > rows[bestRow]) bestRow = r;
            if (cols[c] > cols[bestCol]) bestCol = c;
        }
        int ans = 0;
        for (int c = 1; c < cLen + 1; c++) {
            int total = rows[bestRow] + cols[c];
            if (targets.contains(new Tuple(bestRow, c))) total--;
            ans = max(ans, total);
        }
        for (int r = 1; r < rLen + 1; r++) {
            int total = rows[r] + cols[bestCol];
            if (targets.contains(new Tuple(r, bestCol))) total--;
            ans = max(ans, total);
        }
        out.println(ans);

        out.close();
    }


    // Generated Code Below:
    private static final FastWriter out = new FastWriter();
    private static FastScanner in;
    static ArrayList<Integer>[] adj;
    private static long e97 = (long)1e9 + 7;
    static class FastWriter {
        private static final int IO_BUFFERS = 128 * 1024;
        private final StringBuilder out;
        public FastWriter() { out = new StringBuilder(IO_BUFFERS); }
        public FastWriter p(Object object) { out.append(object); return this; }
        public FastWriter p(String format, Object... args) { out.append(String.format(format, args)); return this; }
        public FastWriter pp(Object... args) { for (Object ob : args) { out.append(ob).append(" ");  } out.append("\n"); return this; }
        public FastWriter pp(int[] args) { for (int ob : args) { out.append(ob).append(" ");  } out.append("\n"); return this; }
        public FastWriter pp(long[] args) { for (long ob : args) { out.append(ob).append(" ");  } out.append("\n"); return this; }
        public FastWriter pp(char[] args) { for (char ob : args) { out.append(ob).append(" ");  } out.append("\n"); return this; }
        public void println(long[] arr) { out.append(Arrays.toString(arr)).append("\n"); }
        public void println(int[] arr) { out.append(Arrays.toString(arr)).append("\n"); }
        public void println(char[] arr) { out.append(Arrays.toString(arr)).append("\n"); }
        public void println(double[] arr) { out.append(Arrays.toString(arr)).append("\n"); }
        public void println(boolean[] arr) { out.append(Arrays.toString(arr)).append("\n"); }
        public <T>void println(T[] arr) { out.append(Arrays.toString(arr)).append("\n"); }
        public void println(long[][] arr) {  for (long[] row: arr) out.append(Arrays.toString(row)).append("\n"); }
        public void println(int[][] arr) {  for (int[] row: arr) out.append(Arrays.toString(row)).append("\n"); }
        public void println(char[][] arr) {  for (char[] row: arr) out.append(Arrays.toString(row)).append("\n"); }
        public void println(double[][] arr) {  for (double[] row: arr) out.append(Arrays.toString(row)).append("\n"); }
        public <T>void println(T[][] arr) {  for (T[] row: arr) out.append(Arrays.toString(row)).append("\n"); }
        public FastWriter println(Object object) { out.append(object).append("\n"); return this; }
        public void toFile(String fileName) throws IOException {
            BufferedWriter writer = new BufferedWriter(new FileWriter(fileName));
            writer.write(out.toString());
            writer.close();
        }
        public void close() throws IOException { System.out.print(out); }
    }
    static class FastScanner {
        private InputStream sin = System.in;
        private final byte[] buffer = new byte[1024];
        private int ptr = 0;
        private int buflen = 0;
        public FastScanner(){}
        public FastScanner(String filename) throws FileNotFoundException {
            File file = new File(filename);
            sin = new FileInputStream(file);
        }
        private boolean hasNextByte() {
            if (ptr < buflen) {
                return true;
            }else{
                ptr = 0;
                try {
                    buflen = sin.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 static 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 longNext() {
            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) || b == ':'){
                    return minus ? -n : n;
                }else{
                    throw new NumberFormatException();
                }
                b = readByte();
            }
        }
        public int intNext() {
            long nl = longNext();
            if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE) throw new NumberFormatException();
            return (int) nl;
        }
        public double doubleNext() { return Double.parseDouble(next());}
        public long[] nextLongArray(final int n){
            final long[] a = new long[n];
            for (int i = 0; i < n; i++)
                a[i] = longNext();
            return a;
        }
        public int[] nextIntArray(final int n){
            final int[] a = new int[n];
            for (int i = 0; i < n; i++)
                a[i] = intNext();
            return a;
        }
        public double[] nextDoubleArray(final int n){
            final double[] a = new double[n];
            for (int i = 0; i < n; i++)
                a[i] = doubleNext();
            return a;
        }
        public ArrayList<Integer>[] getAdj(int n) {
            ArrayList<Integer>[] adj = new ArrayList[n + 1];
            for (int i = 1; i <= n; i++) adj[i] = new ArrayList<>();
            return adj;
        }
        public ArrayList<Integer>[] adjacencyList(int nodes, int edges) throws IOException {
            return adjacencyList(nodes, edges, false);
        }
        public ArrayList<Integer>[] adjacencyList(int nodes, int edges, boolean isDirected) throws IOException {
            adj = getAdj(nodes);
            for (int i = 0; i < edges; i++) {
                int a = intNext(), b = intNext();
                adj[a].add(b);
                if (!isDirected) adj[b].add(a);
            }
            return adj;
        }
    }
    static class Tuple implements Comparable<Tuple> {
        long a;
        long b;
        long c;
        public Tuple(long a, long b) {
            this.a = a;
            this.b = b;
            this.c = 0;
        }
        public Tuple(long a, long b, long c) {
            this.a = a;
            this.b = b;
            this.c = c;
        }
        public long getA() { return a; }
        public long getB() { return b; }
        public long getC() { return c; }
        public int compareTo(Tuple other) {
            if (this.a == other.a) {
                if (this.b == other.b) return Long.compare(this.c, other.c);
                return Long.compare(this.b, other.b);
            }
            return Long.compare(this.a, other.a);
        }
        @Override
        public int hashCode() { return Arrays.deepHashCode(new Long[]{a, b, c}); }
        @Override
        public boolean equals(Object o) {
            if (!(o instanceof Tuple)) return false;
            Tuple pairo = (Tuple) o;
            return (this.a == pairo.a && this.b == pairo.b && this.c == pairo.c);
        }
        @Override
        public String toString() { return String.format("(%d %d %d)  ", this.a, this.b, this.c); }
    }
    private static int max(int... ins){ int max = ins[0]; for(int i=1; i<ins.length; i++){ if(ins[i] > max) max = ins[i]; } return max; }

}


Measured memory_bytes: 97012