/*
 *      ┌─┐       ┌─┐ + +
 *   ┌──┘ ┴───────┘ ┴──┐++
 *   │                 │
 *   │       ───       │++ + + +
 *   ███████───███████ │+
 *   │                 │+
 *   │       ─┴─       │
 *   │                 │
 *   └───┐         ┌───┘
 *       │         │
 *       │         │   + +
 *       │         │       Code is far away from bug with the animal protecting
 *       │         └──────────────┐
 *       │                        │
 *       │                        ├─┐
 *       │                        ┌─┘
 *       │                        │
 *       └─┐  ┐  ┌───────┬──┐  ┌──┘  + + + +
 *         │ ─┤ ─┤       │ ─┤ ─┤
 *         └──┴──┘       └──┴──┘  + + + +
 *                神兽保佑
 *               代码无BUG!
 */

#include<bits/stdc++.h>
using namespace std;
class IN{
public:
    template<typename T>
    IN& operator >>(T &x){read(x);return *this;}
    IN& operator >>(double &x){scanf("%lf",&x);return *this;}
    IN& operator >>(char *s){scanf("%s",s);return *this;}
    IN& operator >>(char &c){c=getchar();return *this;}
private:
    template<typename T>
    void read(T &x){
        T f=1;int c=getchar();x=0;
        while(c<'0'||c>'9'){if(c=='-')f=-1;c=getchar();}
        while(c>='0'&&c<='9')x=(x<<3)+(x<<1)+(c^48),c=getchar();
        x*=f;
    }
}in;
class NL{}nl;
class BK{}bk;
class OUT{
public:
    template<typename T>
    OUT& operator <<(T x){write(x);return *this;}
    OUT& operator <<(const char *s){printf("%s",s);return *this;}
    OUT& operator <<(char c){putchar(c);return *this;}
    OUT& operator <<(BK x){putchar(' ');return *this;}
    OUT& operator <<(NL x){putchar('\n');return *this;}
private:
    template<typename T>
    void write(T x){
        if(x<0)putchar('-'),x=-x;
        if(x>=10)write(x/10);
        putchar(x%10+48);
    }
}out;

#define pb(x) push_back(x)
#define fi first
#define se second
#define rep(i,a,n) for(int i=a;i<=n;++i)
#define per(i,n,a) for(int i=n;i>=a;--i)
#define mem(a,x) memset(a,x,sizeof(a))
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> PI;
typedef pair<ll,ll> PL;
typedef vector<int> VI;
typedef vector<ll> VL;
// Smax
//int Smax() { return -INF; }
template <typename T>
T Smax(T x) { return x; }
template<typename T, typename... Args>
T Smax(T a, Args... args) { return max(a, Smax(args...)); }
// Smin
template <typename T>
T Smin(T x) { return x; }
template<typename T, typename... Args>
T Smin(T a, Args... args) { return min(a, Smin(args...)); }

/*****************************************************************************************************/
ll Pow(ll a,ll b,ll mod){ll res=1;a%=mod;while(b){if(b&1)(res*=a)%=mod;(a*=a)%=mod;b>>=1;}return res%mod;}
ll inv(ll a,ll p){if(a==1)return 1;return (p-p/a)*inv(p%a,p)%p;}//p为素数,a<p
ll C(ll n,ll m,ll p){ll res=1;for(ll i=1,j=n-m+1;i<=m;++i,++j){res=res*inv(i,p)%p*j%p;}return res;}
/*****************************************************************************************************/
/*ll ask(int x){ll res=0;while(x)res+=c[x],x-=x&-x;return res;}
void add(ll v,int x){while(x<=n)c[x]+=v,x+=x&-x;}*/
const int p=1e9+7;
const int N=3e5+10;

PI a[N],b[N];
map<PI,int> mp;
int main(){
    int h,w,m;
    in>>h>>w>>m;
    rep(i,1,h)a[i].se=i;
    rep(i,1,w)b[i].se=i;

    rep(i,1,m){
        int x,y;
        in>>x>>y;
        ++a[x].fi;
        ++b[y].fi;
        mp[PI(x,y)]++;
    }
    sort(a+1,a+1+h);
    sort(b+1,b+1+w);

    int ans=0;
    int ma=a[h].fi;
    int mb=b[w].fi;
    
    int cnt=0;
    per(i,h,1){
        if(a[i].fi!=ma)break;
        per(j,w,1){
            if(b[j].fi!=mb)break;
            ans=max(ans,ma+mb-mp[PI(a[i].se,b[j].se)]);
            if(++cnt>2000000)break;
        }
        if(cnt>2000000)break;
    }
    out<<ans;
    return 0;
}


Measured memory_bytes: 152060