#include <fstream>

using namespace std;

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
#define N 5001

int profit[N];

bool verif();

int n,G,w[N],p[N],i,g,maxx;

int main()
{
    fin>>n>>G;
    for (i=1;i<=n;i++)
        fin>>w[i]>>p[i];
    for (i=1;i<=n;i++)
    {
        for (g=G-w[i];g>=0;g--)
                if (profit[w[i]+g]<profit[g]+p[i])
                    profit[w[i]+g]=profit[g]+p[i], maxx=(profit[w[i]+g]>maxx?profit[w[i]+g]:maxx);
    }
    fout<<maxx<<'\n';
    fout.close();
    return 0;
}