#include <fstream>
#include <algorithm>
using namespace std;

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

int main()
{
    int G, N;
    fin >> N >> G;
    int g[500], p[500];
    for (int i = 0; i < N; i++)
    {
        fin >> g[i] >> p[i];
    }

    int arr[500][500];

    for (int i = 1; i <= N; i++)
    {
        for (int j = 1; j <= G; j++)
        {
            if (j < g[i - 1])
            {
                arr[i][j] = arr[i - 1][j];
            }
            else
            {
                arr[i][j] = max(arr[i - 1][j], arr[i - 1][j - g[i - 1]] + p[i - 1]);
            }
        }
    }

    fout << arr[N][G] << endl;

    return 0;
}