#include <iostream>
#include <fstream>
#include <stdio.h>
using namespace std;
int a[100],b[100],e,g,i,maxi,nr;
int main()
{
    ifstream f ("energii.in");
    ofstream h ("energii.out");
    f>>g;
    f>>e;
    while(!f.eof())
        {
        f>>a[i];
        f>>b[i];
        if((b[i]>nr)&&(a[i]<=e))
            {
            nr=b[i];
            maxi=i;
            }
        i++;
        }
        h<<b[maxi];

f.close();
h.close();
    return 0;
}