#include "cipizz.h"

#include <iostream>
#include <vector>

int main() {
  int n, m, k;
  std::cin >> n >> m >> k;

  std::vector<int> x(k), y(k);
  for (int i = 0; i < k; i++) {
    std::cin >> x[i] >> y[i];
  }

  std::cout << count_triangles(n, m, x, y) << "\n";
  return 0;
}