#include <fstream>
#define GMAX 10002
#define NMAX 5004
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int n,G;
int g[NMAX];
int c[NMAX];
int 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>0;x--)
         if(x>=g[i])
          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;
}