#include <fstream>
#include <cstring>

#define MINF 0x80808080

using namespace std;

int g[5010], c[5010];
int d[10010];

int n, G, i, jnext, sol, pmaxim, j;

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

    fin>>n>>G;
    for (i=1;i<=n;i++)
        fin>>g[i]>>c[i];

    memset(d, 0x80, sizeof(d));
//    fout<<d[1];
    d[0] = 0;
    pmaxim = 0;
    for (i=1;i<=n;i++) {
        for (j=pmaxim; j>=0;j--) {
            if (d[j] != MINF) {
                jnext = j + g[i];
                if (jnext <= G) {
                    d[jnext] = max(d[jnext], d[j] + c[i]);
                    sol = max(sol, d[jnext]);
                    pmaxim = max(pmaxim, jnext);
                }
            }
        }
    }

    fout<<sol;

    return 0;
}