#include <fstream>
#define NMAX 5004
#define GMAX 10002

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

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]];
}