#include <fstream>

using namespace std;

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

const int NMAX=10000;
int d[NMAX+5];

int main()
{
    int n,G,i,j,g,p,last,ans;
    fin>>n>>G;
    for(i=1;i<=G;i++)
        d[i]=-1;
    last=0;
    for(i=1;i<=n;i++)
    {
        fin>>g>>p;
        for(j=last;j>=0;j--)
        {
            if(d[j]!=-1)
            {
                if(j+g>G)
                    continue;
                if(d[j]+p>d[j+g])
                {
                    d[j+g]=d[j]+p;
                    if(j+g>last)
                        last=j+g;
                }
            }
        }
    }
    ans=0;
    for(j=G;j>=1;j--)
        if(d[j]>ans)
            ans=d[j];
    fout<<ans;
    fin.close();
    fout.close();
    return 0;
}