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#include <fstream>
#include <cstring>
#include <algorithm>
using namespace std;
ifstream fin("energii.in");
ofstream fout("energii.out");
int n, w, i, e,aux,c,j;
int d[5002];
int main()
{
fin>>n>>w;
for(i=1;i<=n;i++)
{
fin>>e>>c;
for(j=1;j<w;j++)
{
if(d[j]==0)
{
aux=j+e;
if(aux>w)
aux=w;
d[aux]=min(d[aux], d[j]+c);
}
}
if(e>w)
e=w;
if(d[e]==0)
d[e]=c;
else
d[e]=min(d[e], c);
}
fout<<d[w];
return 0;
}