#include <fstream>
#define NMAX 10005
#define GMAX 5010

using namespace std;

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

int n, G, val;
int W[GMAX], P[GMAX], pd[2][NMAX];

void citire();
void Dinamica();
void afisare();

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

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

void Dinamica()
{
    int i, j;
    val=1;
    for (i=1; i<=n; i++)
    {
        for (j=0; j<=G; j++)
        {
            pd[val][j]=pd[1-val][j]; //nu iau ob i
            if (W[i]<=j) // daca pot lua ob i
                if (pd[val][j]<pd[1-val][j-W[i]]+P[i])
                    pd[val][j]=pd[1-val][j-W[i]]+P[i];
        }
        val=1-val;
    }
}

void afisare()
{
    fout<<pd[1-val][G]<<'\n';
}