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#include <fstream>
using namespace std;
#define MXN 5001
#define MXG 5001
ifstream fin("energii.in");
ofstream fout("energii.out");
long V[MXG];
int D[MXN][MXG];
int n,g;
int w[MXN],p[MXN];
int rucsac()
{
int i,j;
for(i=1; i<=n; i++)
for(j=g; j>=w[i]; j--)
V[j]=max(V[j],V[j-w[i]]+p[i]);
return V[g];
}
int main()
{
int i;
fin>>n>>g;
for(i=1; i<=n; i++)
fin>>w[i]>>p[i];
fout<<rucsac();
fin.close();
fout.close();
return 0;
}