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#include <iostream>
#include <fstream>
#include <stdio.h>
using namespace std;
int a,b,e,g,i,maxi1,maxi2,maxi3,b3,b2,b1,nr;
int main()
{
ifstream f ("energii.in");
f>>g;
f>>e;
while(!f.eof())
{
f>>a;
f>>b;
if(a>maxi1)
{
maxi3=maxi2;
maxi2=maxi1;
maxi1=a;
b3=b2;
b2=b1;
b1=b;
}
}
ofstream g ("energii.out");
if(maxi1+maxi2+maxi3<e)
g<<-1;
else if(maxi1>=e) g<<b1;
else if(maxi1+maxi3>=e)
g<<b1+b3;
else if(maxi1+maxi2)
g<<b1+b2;
f.close();
g.close();
return 0;
}