#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int maxim,N,G,w[5001],p[5001],sol[5001];
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)
        {
            sol[j+w[i]]=max(sol[j+w[i]],sol[j]+p[i]);
            if(sol[j+w[i]]>maxim)
                maxim=sol[j+w[i]];
        }
    g<<maxim;
    g.close();
}