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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("energii.in");
ofstream fout("energii.out");
int n,w,e[10001],c[10001],sol[10001],i,j,nr=0;
int main()
{
fin>>n>>w;
for(i=1;i<=n;i++)
fin>>e[i]>>c[i];
j=1;
for(i=1;i<=n;i++)
if(e[i]>=w){sol[j]=c[i];j++;nr++;}
int mini=sol[1];
if(nr==0)fout<<-1;
else
{for(i=1;i<=nr;i++)
if(sol[i]<mini)mini=sol[i];
fout<<mini;
}
}