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#include <iostream>
#include <fstream>
using namespace std;
int main()
{int n,m,ok,l,v[100],a[100],i,on,s;
ifstream f("energii.in");
ofstream g("energii.out");
f>>n>>m;
for(i=1;i<=n;i++)
{
f>>v[i];
f>>a[i];
}
ok=0;
i=1;
while((ok==0)&&(i<=n))
{
if(v[i]>=m)
{
l=a[i];
ok=1;
}
i++;
}
on=0;
for(i=1;i<=n;i++)
{
if(v[i]>=m)
{
if(l>=a[i])
{
l=a[i];
on=1;
}
}
}
s=-1;
if(on==1)
{
g<<l;
}
else
{
g<<s;
}
return 0;
}