#include <fstream>
using namespace std;

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

int gr[5010], val[5010], n, gmax, i, j, a[5010][10010];

int main()
{
    fin>>n>>gmax;

    for (i=1; i<=n; i++)
        fin>>gr[i]>>val[i];

    for (i=1; i<=n; i++)
    {
        for (j=0; j<=gmax; j++)
        {
            if (gr[i]>j)
                a[i][j]=a[i-1][j];
            else
            {
                if (a[i-1][j-gr[i]]+val[i]>a[i-1][j])
                    a[i][j]=a[i-1][j-gr[i]]+val[i];
                else
                    a[i][j]=a[i-1][j];
            }
        }
    }

    fout<<a[n][gmax];

    fin.close();
    fout.close();
    return 0;
}