#include <bits/stdc++.h>
using namespace std;

int main(void){
//input
	int N,W; cin >> N >> W;
	int v[N],w[N];
	for (int i = 0; i < N; i++) {
		cin >> v[i] >> w[i];
	}
//calc
	vector<int> vol_v;
	for (int i = 0; i < N; i++) {
		if(w[i] <= W){
			vol_v.push_back(v[i]);
		}
	}
	sort(vol_v.begin(), vol_v.end(), greater<int>());
//output
	cout << vol_v[0] << endl;
}