#include <fstream>
#include <algorithm>
#define NMAX 5005

using namespace std;

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

int i, j, n, G, gr, dp[2][2 * NMAX], pr;

int main()
{
    f >> n >> G;

    for (i = 1; i <= n; ++ i)
    {
        f >> gr >> pr;

        for (j = 0; j <= G; ++ j)
        {
            dp[i % 2][j] = dp[(i + 1) % 2][j];

            if (j - gr >= 0)
                dp[i % 2][j] = max(dp[i % 2][j], dp[(i + 1) % 2][j - gr] + pr);
        }
    }

    g << dp[n % 2][G] << '\n';

    return 0;
}