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#include <fstream>
using namespace std;
ifstream in("energii.in");
ofstream out("energii.out");
int c[1002],e[5002],cost,n,energie[10002],eng;
const int x=10002;
int main()
{
in>>n>>eng;
for(int i=1;i<=n;i++)
in>>e[i]>>c[i];
energie[0]=0;
for(int i=1;i<=eng;i++)
energie[i]=x;
for(int i=1;i<=n;i++)
for(int j=eng-e[i];j>=0;j--)
if(energie[j]!=x&&c[i]+energie[j]<energie[j+e[i]])
energie[j+e[i]]=c[i]+energie[j];
out<<energie[eng];
return 0;
}