#include <iostream>
#include <cassert>
#include <cstdlib>
#include <algorithm>
#include <vector>
using namespace std;

int N, maxH,seed;

// utilizzo: ./generatore N maxH seed
int main(int argc, char** argv) {
	assert(argc >= 2);
	N      = atoi(argv[1]);
	// se N è 0 stampa il caso di prova
	if (N == 0) {
		cout << "8" << endl;
		cout << "6 6" << endl;
		cout << "8 5" << endl;
		cout << "7 3" << endl;
		cout << "3 7" << endl;
		cout << "4 6" << endl;
		cout << "2 2" << endl;
		cout << "5 9" << endl;
		cout << "1 1" << endl;
		return 0;
	}
	assert(argc == 4);
	maxH   = atoi(argv[2]);
	seed   = atoi(argv[3]);
	srand(seed);
	assert(0 < N && N <= 1000);
	assert(0 <= maxH && maxH <= 1000);
    cout << N << endl;
    for(int i = 0; i < N; ++i)
        cout << rand() % maxH+1 << " " << rand() % 50000 + 1 << endl;

	return 0;
}