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#include <fstream>
#define INF 20000
using namespace std;
ifstream fin("denergii.in");
ofstream fout("energii.out");
int MAT[2][20001];
int G,N;
struct salut
{
int g,p;
};
salut Ruc[20000];
int main()
{
fin>>N>>G;
for(int i=1;i<=2;i++)
for(int j=1;j<=G;j++)
MAT[i][j]=INF;
for(int i=1;i<=N;i++)
fin>>Ruc[i].g>>Ruc[i].p;
int k=0;
for(int i=1;i<=N;i++,k=1-k)
for(int j=1;j<=G;j++)
if(j>=Ruc[i].g)
MAT[k][j]=min(MAT[1-k][j],MAT[1-k][j-Ruc[i].g]+Ruc[i].p);
else
MAT[k][j]=MAT[1-k][j];
fout<<MAT[1-k][G];
return 0;
}