//对于复杂的题 先找规律 再用计算机语言解答
#include <cstdio>
#include <iostream>

using namespace std;

int main()
{
    int m, n;
    cin >> m >> n;

    int i;
    cin >> i;

    int nut = 0;

    while (i--)
    {
        int x, y;
        cin >> x >> y;

        int cx = m / 2 + 1, cy = n / 2 + 1;

        if (abs(x - cx) + abs(y - cy) <= max(m, n) / 2) nut++;
    }

    cout << nut;

    return 0;
}

https://ac.nowcoder.com/acm/contest/94145/F