#include<algorithm>
#include<iostream>
#include<vector>

using namespace std;
using ll = long long;

int main() {

	int N, M;
	cin >> N >> M;

	vector<int> Date(N);

	for (int i = 0; i < N; i++) {
		int A, B;
		cin >> A >> B;
		Date[i] = (M - A) / B;
	}

	sort(Date.begin(), Date.end());

	int ans = 0;

	for (int i = 0; i < N; i++) {
		if (Date[i] != 0) ans = max(ans, i / Date[i]);
		else ans = i + 1;
	}

	cout << ans << endl;


	return 0;
}