#include <iostream>
#include <fstream>
using namespace std ;
int main ()
{
    int g,w,eg[10001],cg[10001],i;
    ifstream cin ("energii.in");
    ofstream cout ("energii.out");
    cin>>g;
    cin>>w;
    for (i=1;i<=g;i++)
    cin>>eg[i]>>cg[i];
    
    
    for (i=1;i<=g;i++)
    
    if (eg[i]>=w)

    cout<<cg[i];
   
    
    cin.close();
    cout.close();
    return 0 ;
}