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#include <fstream>
#include <algorithm>
#include <iostream>
using namespace std;
ifstream fin("energii.in");
ofstream fout("energii.out");
int G,W,EG[1005],CG[1005],V[1005];
int energii()
{
int i,j;
for(i=1;i<=G;i++)
for(j=W;j>=EG[i];j--)
V[j]=min(V[j],V[j-EG[i]]+CG[i]);
return V[W];
}
int main()
{
fin>>G;
fin>>W;
for(int i=1;i<=G;i++)
fin>>EG[i]>>CG[i];
fout<<energii();
}