# include <fstream>
# include <algorithm>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int i,j,n,G;
int P[5005],gr[5005],a[10005],b[10005];
int main ()
{
    f>>n>>G;
    for (i=1; i<=n; ++i)
        f>>gr[i]>>P[i];

    for (i=1; i<=n; ++i)
    {
        for (j=0; j<=G; ++j)
        {
            b[j]=a[j];
            if (gr[i]<=j) b[j]=max(b[j],a[j-gr[i]]+P[i]);
        }
        swap(a,b);
    }
    g<<a[G]<<"\n";

    return 0;
}