#include <iostream>
#include <fstream>
using namespace std;

ifstream fin ("energii.in");
ofstream fout ("energii.out");

struct generator{
    int power;
    int price;
};

int main()
{
    int g;
    int w;

    fin >> g;
    fin >> w;

    int pret = 10002;

    generator x;

    int i=1;
    while (i<=g)
    {
        fin >> x.power;
        fin >> x.price;

        if (x.power >= w && x.price <=pret)
            pret=x.price;
        i++;
    }

    fout << pret;

    return 0;
}