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#include<iostream>
using namespace std;
int greu[10001],pierd[10001],castig[1000000],i,n,s=999999999,cautat,smax,j;
#include<fstream>
ifstream f("energii.in");
ofstream g("energii.out");
int main()
{
f>>n>>cautat;
for(i=1;i<=n;i++)
{f>>greu[i]>>pierd[i];
smax=smax+greu[i];
}
for(i=1;i<=smax;i++)
castig[i]=999999999;
for(i=1;i<=n;i++)
{for(j=smax-greu[i];j>=0;j--)
if(castig[j+greu[i]]>castig[j]+pierd[i])
{
castig[j+greu[i]]=castig[j]+pierd[i];
if(castig[j+greu[i]]<s&&j+greu[i]>=cautat)
s=castig[j+greu[i]];
}
}
if(s!=0)
g<<s;
else
g<<"-1";
}