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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("energii.in");
ofstream fout("energii.out");
int n,w,e[10005],c[10005];
int main()
{
fin>>n>>w;
for(int i=1;i<=n;i++)
{
fin>>e[i]>>c[i];
}
sort(e+1,e+n+1);
int mini=c[n];
if(e[n]<w)fout<<-1;
else
{for(int i=1;i<=n;i++)
if(e[i]>w&&c[i]<mini)mini=c[i];
fout<<mini;}
}