#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); i++)
using namespace std;
using ll = long long;

int cnt[1001001];

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int N; ll M; cin >> N >> M;
    rep(i, N){
        ll a, b; cin >> a >> b;
        ll limit = min((ll)N - 1, (M - a) / b);
        cnt[limit]++;
    }
    int sm = 0;
    int ans = 0;
    rep(i, N){
        sm += cnt[i];
        ans = max(ans, (sm + i) / (i + 1));
    }
    cout << ans << endl;
}