#include <iostream>
using namespace std;

int main() {
    int M, T;
    cin >> M >> T;
    long long mn = 1e10;
    int ans = -1;
    for (int i = 0; i < M; i++) {
        int t, f ;
        cin >> t >> f;
        if (T < t and  t - T < mn) {
            mn = t - T;
            ans = f;
        }
    }
    cout << ans << endl;
    return 0;
}