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#include <fstream>
#include <climits>
using namespace std;
ifstream fin ("energii.in");
ofstream fout("energii.out");
int n,E,eg[1005],cg[1005],i,aux,sol,j;
int main()
{
fin>>n;
fin>>E;
for(i=1;i<=n;i++)
fin>>eg[i]>>cg[i];
for(i=1;i<n;i++)
for(j=i+1;j<=n;j++)
if(cg[i]>cg[j])
{
swap(cg[i], cg[j]);
swap(eg[i], eg[j]);
}
for(i=1;i<=n;i++)
{
if(eg[i]>=E)
{
fout<<cg[i];
return 0;
}
else
sol++;
}
if(sol)
fout<<-1;
return 0;
}