#include <fstream>
using namespace std;
#define NMAX 5001
#define GMAX 10001

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

struct obiect
{
    int v, g;
};

int max(int a, int b)
{
    if (a > b)
        return a;
    else
        return b;
}

int argg[NMAX][GMAX];
int n, gmax;

int main ()
{
    fin>>n>>gmax;
    obiect ob[n + 1];

    for (int i = 1; i <= n; i++)
        fin>>ob[i].g>>ob[i].v;
    
    for (int i = 1; i <= n; i ++)
    {
        for (int j = 1; j <= gmax; j++)
        {
            if (ob[i].g <= j)
            {
                argg[i][j] = max(argg[i - 1][j - ob[i].g] + ob[i].v, argg[i - 1][j]);
            }
            else
            {
                argg[i][j] = argg[i - 1][j];
            }
        }
    }
    fout<<argg[n][gmax];
    fin.close();
    fout.close();
    return 0;
}