#include <bits/stdc++.h>
#define pii pair<int, int>
#define x first
#define y second
using namespace std;
int N, L, M, ans = INT_MIN;
vector<pii> V;
void find_fish(int sx, int sy, int ex, int ey)
{
int cnt = 0;
for (int i = 0; i < M; i++)
{
if (V[i].x >= sx && V[i].x <= ex && V[i].y >= sy && V[i].y <= ey)
cnt++;
}
ans = max(ans, cnt);
}
void rotate(int idx, int left, int right)
{
pii pre = V[idx];
for (int i = 0; i < left; i++)
{
pre.x -= 1;
find_fish(pre.x, pre.y, pre.x + left, pre.y + right);
}
for (int i = 0; i < right; i++)
{
pre.y -= 1;
find_fish(pre.x, pre.y, pre.x + left, pre.y + right);
}
for (int i = 0; i < left; i++)
{
pre.x += 1;
find_fish(pre.x, pre.y, pre.x + left, pre.y + right);
}
for (int i = 0; i < right; i++)
{
pre.y += 1;
find_fish(pre.x, pre.y, pre.x + left, pre.y + right);
}
}
int main()
{
cin >> N >> L >> M; V.resize(M);
for (auto& iv : V)
cin >> iv.x >> iv.y;
for (int i = 0; i < M; i++) // 물고기 잡힘
{
for (int le = 1; le < L >> 1; le++) // 그물 정함
{
int ri = (L >> 1) - le;
rotate(i, le, ri);
}
}
cout << ans;
}
