#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int maxim,N,G,w[50000],p[50001],sol[50001];
int main()
{
    f>>N>>G;
    for(int i=1;i<=N;++i)
        f>>w[i]>>p[i];
    for(int i=1;i<=N;++i)
        for(int j=G-w[i];j>-1;--j)
            if(sol[j+w[i]]<sol[j]+p[i])
            {
                j[sol+w[i]]=sol[j]+p[i];
                if(sol[j+w[i]]>maxim)
                    maxim=sol[j+w[i]];
            }
    g<<maxim;
    g.close();
    return 0;
}