#include <fstream>

using namespace std;

ifstream f("rucsac.in");
ofstream g("rucsac.out");

int n, G, i, j;
int w[5001], p[5001];
int best[10001];
int rez;

int main()
{
    f >> n >> G;
    for (i=1; i<=n; i++)
        f >> w[i] >> p[i];

    for (i=1; i<=n; i++)
        for (j=G-w[i]; j>=0; j--)
        {
            best[j+w[i]] = max(best[j+w[i]], best[j] + p[i]);
            rez = max(rez, best[j+w[i]]);
        }

    g << rez;

    return 0;
}