#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';
    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;
    cmax[0] = 0;
    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]];
}