// Utilities
import java.io.*;
import java.util.*;

public class Main {
	static int H, W;
	static int[] rowCnt, colCnt;
	static int M;
	static int h, w;
	static HashMap<Integer, HashSet<Integer>> map = new HashMap<Integer, HashSet<Integer>>();
	static int maxR = -1, maxC = -1;
	static ArrayList<Integer> aR = new ArrayList<Integer>();
	static int max = 0;
	
	public static void main(String[] args) throws IOException {
		H = in.iscan(); W = in.iscan(); M = in.iscan();
		rowCnt = new int[H+1]; colCnt = new int[W+1];
		for (int i = 0; i < M; i++) {
			h = in.iscan(); w = in.iscan();
			rowCnt[h]++; colCnt[w]++;
			if (!map.containsKey(h)) map.put(h, new HashSet());
			map.get(h).add(w);
		}
		for (int i = 1; i <= H; i++) {
			if (maxR == -1 || rowCnt[i] > rowCnt[maxR]) {
				aR.clear();
				maxR = i;
				aR.add(i);
			}
			else if (rowCnt[i] == rowCnt[maxR]){
				aR.add(i);
			}
		}
		boolean no_dpl = true;
		for (int j = 1; j <= W; j++) {
			if (maxC == -1 || colCnt[j] > colCnt[maxC]) {
				maxC = j;
				no_dpl = noDuplicate(j);
			}
			else if (colCnt[j] == colCnt[maxC] && no_dpl == false && noDuplicate(j)) {
				maxC = j;
				no_dpl = true;
			}
		}
		max = rowCnt[maxR] + colCnt[maxC];
		if (!no_dpl) max--;
		out.println(max);
		out.close();
	} 
	
	static boolean noDuplicate(int col) {
		for (int mxi : aR) {
			if (!map.get(mxi).contains(col)) return true;
		}
		return false;
	}
	
	static INPUT in = new INPUT(System.in);
	static PrintWriter out = new PrintWriter(System.out);
	private static class INPUT {

		private InputStream stream;
		private byte[] buf = new byte[1024];
		private int curChar, numChars;

		public INPUT (InputStream stream) {
			this.stream = stream;
		}

		public INPUT (String file) throws IOException {
			this.stream = new FileInputStream (file);
		}

		public int cscan () throws IOException {
			if (curChar >= numChars) {
				curChar = 0;
				numChars = stream.read (buf);
			}
			
			if (numChars == -1)
				return numChars;

			return buf[curChar++];
		}

		public int iscan () throws IOException {
			int c = cscan (), sgn = 1;
			
			while (space (c))
				c = cscan ();

			if (c == '-') {
				sgn = -1;
				c = cscan ();
			}

			int res = 0;

			do {
				res = (res << 1) + (res << 3);
				res += c - '0';
				c = cscan ();
			}
			while (!space (c));

			return res * sgn;
		}

		public String sscan () throws IOException {
			int c = cscan ();
			
			while (space (c))
				c = cscan ();

			StringBuilder res = new StringBuilder ();

			do {
				res.appendCodePoint (c);
				c = cscan ();
			}
			while (!space (c));

			return res.toString ();
		}

		public double dscan () throws IOException {
			int c = cscan (), sgn = 1;
			
			while (space (c))
				c = cscan ();

			if (c == '-') {
				sgn = -1;
				c = cscan ();
			}

			double res = 0;

			while (!space (c) && c != '.') {
				if (c == 'e' || c == 'E')
					return res * UTILITIES.fast_pow (10, iscan ());
				
				res *= 10;
				res += c - '0';
				c = cscan ();
			}

			if (c == '.') {
				c = cscan ();
				double m = 1;

				while (!space (c)) {
					if (c == 'e' || c == 'E')
						return res * UTILITIES.fast_pow (10, iscan ());

					m /= 10;
					res += (c - '0') * m;
					c = cscan ();
				}
			}

			return res * sgn;
		}

		public long lscan () throws IOException {
			int c = cscan (), sgn = 1;
			
			while (space (c))
				c = cscan ();

			if (c == '-') {
				sgn = -1;
				c = cscan ();
			}

			long res = 0;

			do {
				res = (res << 1) + (res << 3);
				res += c - '0';
				c = cscan ();
			}
			while (!space (c));

			return res * sgn;
		}

		public boolean space (int c) {
			return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
		}
	}

	public static class UTILITIES {

		static final double EPS = 10e-6;

		public static int lower_bound (int[] arr, int x) {
			int low = 0, high = arr.length, mid = -1;

			while (low < high) {
				mid = (low + high) / 2;

				if (arr[mid] >= x)
					high = mid;
				else
					low = mid + 1;
			}

			return low;
		}

		public static int upper_bound (int[] arr, int x) {
			int low = 0, high = arr.length, mid = -1;

			while (low < high) {
				mid = (low + high) / 2;

				if (arr[mid] > x)
					high = mid;
				else
					low = mid + 1;
			}

			return low;
		}

		public static long gcd (long a, long b) {
			return b == 0 ? a : gcd (b, a % b);
		}

		public static long lcm (long a, long b) {
			return a * b / gcd (a, b);
		}

		public static long fast_pow_mod (long b, long x, int mod) {
			if (x == 0) return 1;
			if (x == 1) return b;
			if (x % 2 == 0) return fast_pow_mod (b * b % mod, x / 2, mod) % mod;

			return b * fast_pow_mod (b * b % mod, x / 2, mod) % mod;
		}

		public static int fast_pow (int b, int x) {
			if (x == 0) return 1;
			if (x == 1) return b;
			if (x % 2 == 0) return fast_pow (b * b, x / 2);

			return b * fast_pow (b * b, x / 2);
		}

		public static long choose (long n, long k) {
			k = Math.min (k, n - k);
			long val = 1;

			for (int i = 0; i < k; ++i)
				val = val * (n - i) / (i + 1);

			return val;
		}

		public static long permute (int n, int k) {
			if (n < k) return 0;
			long val = 1;

			for (int i = 0; i < k; ++i)
				val = (val * (n - i));

			return val;
		}
	}
}


Measured memory_bytes: 120560