#![allow(unused_parens)]
#![allow(unused_imports)]
#![allow(non_upper_case_globals)]
#![allow(non_snake_case)]
#![allow(unused_mut)]
#![allow(unused_variables)]
#![allow(dead_code)]

use itertools::Itertools;
use proconio::input;
use proconio::marker::{Chars, Usize1};

#[allow(unused_macros)]
#[cfg(debug_assertions)]
macro_rules! mydbg {
    //($arg:expr) => (dbg!($arg))
    //($arg:expr) => (println!("{:?}",$arg));
      ($($a:expr),*) => {
          eprintln!(concat!($(stringify!($a), " = {:?}, "),*), $($a),*);
      }
}
#[cfg(not(debug_assertions))]
macro_rules! mydbg {
    ($($arg:expr),*) => {};
}

macro_rules! echo {
    ($($a:expr),*) => {
          $(println!("{}",$a))*
      }
}

use std::cmp::*;
use std::collections::*;
use std::ops::{Add, Div, Mul, Sub};

#[allow(dead_code)]
static INF_I64: i64 = 92233720368547758;
#[allow(dead_code)]
static INF_I32: i32 = 21474836;
#[allow(dead_code)]
static INF_USIZE: usize = 18446744073709551;
#[allow(dead_code)]
static M_O_D: usize = 1000000007;
#[allow(dead_code)]
static PAI: f64 = 3.1415926535897932;

trait IteratorExt: Iterator {
    fn toVec(self) -> Vec<Self::Item>;
}

impl<T: Iterator> IteratorExt for T {
    fn toVec(self) -> Vec<Self::Item> {
        self.collect()
    }
}

trait CharExt {
    fn toNum(&self) -> usize;
    fn toAlphabetIndex(&self) -> usize;
    fn toNumIndex(&self) -> usize;
}
impl CharExt for char {
    fn toNum(&self) -> usize {
        return *self as usize;
    }
    fn toAlphabetIndex(&self) -> usize {
        return self.toNum() - 'a' as usize;
    }
    fn toNumIndex(&self) -> usize {
        return self.toNum() - '0' as usize;
    }
}

trait VectorExt {
    fn joinToString(&self, s: &str) -> String;
}
impl<T: ToString> VectorExt for Vec<T> {
    fn joinToString(&self, s: &str) -> String {
        return self
            .iter()
            .map(|x| x.to_string())
            .collect::<Vec<_>>()
            .join(s);
    }
}

trait StringExt {
    fn get_reverse(&self) -> String;
}
impl StringExt for String {
    fn get_reverse(&self) -> String {
        self.chars().rev().collect::<String>()
    }
}

trait UsizeExt {
    fn pow(&self, n: usize) -> usize;
}
impl UsizeExt for usize {
    fn pow(&self, n: usize) -> usize {
        return ((*self as u64).pow(n as u32)) as usize;
    }
}

fn main() {
    input! {
       H:usize,
       W:usize,
       M:usize,
    }

    //let mut map = vec![vec![false; W]; H];
    let mut bom = HashSet::new();
    let mut h = vec![0_i64; H];
    let mut w = vec![0_i64; W];
    for _ in 0..M {
        input! {
            x:Usize1,
            y:Usize1,
        }
        bom.insert((x, y));
        h[x] += 1;
        w[y] += 1;
    }

    let mut ans: usize = 0;
    // for i in 0..H {
    //     for j in 0..W {
    //         let mut x = h[i] + w[j];
    //         if x != 0 && bom.contains(&(i, j)) {
    //             x -= 1;
    //         }
    //         ans = max(ans, x);
    //     }
    // }
    let mut h2 = h.iter().enumerate().toVec();
    let mut w2 = w.iter().enumerate().toVec();
    h2.sort_by_key(|x| x.1);
    w2.sort_by_key(|x| x.1);
    h2.reverse();
    w2.reverse();

    let mut ans = max(0, (h2[0].1 + w2[0].1 - 1));
    let m = ans;
    for i in 0..h2.len() {
        for j in 0..w2.len() {
            let mut m2 = h2[i].1 + w2[j].1;
            if m2 < m {
                break;
            }

            if m2 != 0 && bom.contains(&(h2[i].0, w2[j].0)) {
                m2 -= 1;
            } else {
                ans = max(ans, m2);
                break;
            }
            ans = max(ans, m2);
        }
    }

    echo!(ans);
}


Measured memory_bytes: 31844