#include <fstream>

using namespace std;
const int GMAX = 10000;
int d[GMAX+5];
const int INF=-1e9;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int main()
{
    int n,G,w,p,i,j,last,pmax;
    in>>n>>G;
    d[0]=0;
    for(i=1;i<=G;i++)
        d[i]=INF;
    last=0;
    for(i=1;i<=n;i++)
    {
        in>>w>>p;
        for(j=last;j>=0;j--)
        {
            if(j+w>G)
                continue;
            if(d[j]!=INF)
                if(d[j+w]<d[j]+p)
                {
                    d[j+w] = d[j]+p;
                    if(j+w>last)
                        last = j+w;
                }
        }
    }
    pmax=0;
    for(j=1;j<=G;j++)
        if(d[j]>pmax)
        pmax=d[j];
    out<<pmax<<"\n";
    return 0;
}