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#include <fstream>
using namespace std;
ifstream f("energii.in");
ofstream g("energii.out");
int n,E,i,j,e[1001],p[1001],d[5001],emax,mini=2000000000;
int main()
{
f>>n>>E;
for(i=1;i<=n;i++)
{
f>>e[i]>>p[i];
if(e[i]>emax)
emax=e[i];
}
for(i=1;i<=n;i++)
for(j=emax;j>=e[i];j--)
if(d[j-e[i]]+p[i]>d[j])
d[j]=d[j-e[i]]+p[i];
for(i=E;i<=emax;i++)
if(d[i]<mini)
mini=d[i];
g<<mini;
return 0;
}