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#include <bits/stdc++.h>
#define Wmax 5002
using namespace std;
ifstream fin ("energii.in");
ofstream fout ("energii.out");
int g,w,v[Wmax],e,c;
int main()
{
fin>>g>>w;
for(int i=0;i<=w;++i)
v[i]=INT_MAX;
for(int i=1;i<=g;++i){
fin>>e>>c;
for(int j=w;j>=1;--j){
if(e>=j)
v[j]=min(v[j],c);
else if (v[j-e]!=INT_MAX)
v[j]=min(v[j],v[j-e]+c);
}
}
fout<<v[w]<<'\n';
return 0;
}