#include <fstream>
#define NMAX 5005
#define GMAX 10005
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,G;
int g[NMAX],c[NMAX],cmax[GMAX];
void citire()
{
  int i;
  fin>>n>>G;
  for(i=1;i<=n;i++)
    fin>>g[i]>>c[i];
}
void pd()
{
   int i,x;
   for(i=1;i<=n;i++)
     for(x=G;x>=1;x--)
        if(x-g[i]>=0)
        if(cmax[x]<c[i]+cmax[x-g[i]])
          cmax[x]=c[i]+cmax[x-g[i]];

}
int main()
{
    citire();
    pd();
    fout<<cmax[G]<<'\n';
    return 0;
}