#include <fstream>
#define GMAX 10010
#define NMAX 5004

using namespace std;

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

void citire();
void pd();
void afisare();

int G,n,lcrt=2,lprec=1;
int gr[NMAX],p[NMAX];
int pmax[3][2*NMAX];
int maxim;


int main()
{
citire();
pd();
afisare();
    return 0;
}

void pd()
{
int i,j;
//for (i=1;i<=n;i++) pmax[i][0]=0;
for (i=1;i<=G;i++)
     if (gr[1]<=i) pmax[1][i]=p[1];
for (i=2;i<=n;i++)
     {for (j=1;j<=G;j++)
          {
           maxim=pmax[lprec][j];
           if (gr[i]<=j && maxim<p[i]+pmax[lprec][j-gr[i]])
               maxim=p[i]+pmax[lprec][j-gr[i]];
           pmax[lcrt][j]=maxim;
          }
      lcrt=3-lcrt; lprec=3-lprec;
     }
}

void afisare()
{
fout<<maxim<<'\n';
}

void citire()
{
int i;
fin>>n>>G;
for (i=1;i<=n;i++)
     fin>>gr[i]>>p[i];
}