#include <fstream>
using namespace std;
ifstream fin ("rucsac.in");
ofstream fout ("rucsac.out");
int n,g,i,j,h,maxc,a[5005],b[5005],f[10005];
int main()
{
    fin>>n>>g;
    for (i=1; i<=n; i++)
        fin>>a[i]>>b[i];
    for (i=1; i<=n; i++)
    {
        for (j=g; j>0; j--)
        {
            if (f[j]!=0)
            {
                h=j+a[i];
                if (h<=g)
                {
                    if (f[j]+b[i]>f[h])
                        f[h]=f[j]+b[i];
                }
            }
        }
        if (a[i]<=g&&b[i]>f[a[i]])
            f[a[i]]=b[i];
    }
    for (i=1; i<=g; i++)
    {
        if (f[i]>maxc)
            maxc=f[i];
    }
    fout<<maxc;
    return 0;
}