#include"testlib.h"
#include<assert.h>
using namespace std;

const int MIN_HW = 1;
const int MAX_HW = 1'000'000'000;
const int MIN_MUL_HW = 2;
const int MIN_N = 2;
const int MAX_N = 200'000;

int main() {
    registerValidation();

    int H = inf.readInt(MIN_HW, MAX_HW);
    inf.readSpace();
    int W = inf.readInt(MIN_HW, MAX_HW);
    inf.readSpace();
    int N = inf.readInt(MIN_N, MAX_N);
    inf.readEoln();
    assert(MIN_MUL_HW <= H * W);
    set<pair<int,int>> st;
    
    for(int i = 0; i < N; i++){
        int h = inf.readInt(1, H);
        inf.readSpace();
        int w = inf.readInt(1, W);
        inf.readEoln();
        st.insert({h, w});
    }
    inf.readEof();

    assert(st.size() == N);
}