#include <cstdio>  
#include <iostream>  
#include <cstring>  
#include <algorithm>  
#include <map>  
#define INT long long int  
#define MOD 100000007  
using namespace std;  
INT n, m, k, x, y, ans;  
map<pair<INT, INT>,INT> chk;  
int main()  
{  
    ios::sync_with_stdio(false);  
    cin>>n>>m>>k;  
    for(int i = 0 ; i < k ; i++ )  
    {  
        cin>>x>>y;  
        x-=n, y-=m;  
        INT X = abs(x), Y = abs(y);  
        chk[{x/__gcd(X,Y), y/__gcd(X,Y)}]++;  
        
        ans = max( ans, chk[{x/__gcd(X,Y), y/__gcd(X,Y)}]);  
    }  
    cout<<ans<<endl;  
}