# 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];
int main ()
{
    f>>n>>G;
    for (i=1; i<=n; ++i)
        f>>gr[i]>>P[i];

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

    return 0;
}