# include <fstream>
# include <vector>
# include <algorithm>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
vector <int> v[10005];
int i,j,n,G;
int P[5005],gr[5005];
int main ()
{
    f>>n>>G;
    for (i=1; i<=n; ++i)
        f>>gr[i]>>P[i];
    for (i=0; i<=G; ++i)
        v[0].push_back(0);
    for (i=1; i<=n; ++i)
    {
        if (i>2) v[i-2].clear ();
        v[i].push_back(0);
        for (j=0; j<=G; ++j)
        {
            v[i].push_back(0);
            v[i][j]=v[i-1][j];
            if (gr[i]<=j) v[i][j]=max(v[i][j],v[i-1][j-gr[i]]+P[i]);
        }
    }
    g<<v[n][G]<<"\n";

    return 0;
}