#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int N,G,i,j,sol;
int W[5001],P[5001],Optim[10001];
int main()
{
    f>>N>>G;
    for(i=1;i<=N;++i) f>>W[i]>>P[i];
    for(i=1;i<=N;++i)
    {
        for(j=G-W[i];j>=0;--j)
        {
            if(Optim[j+W[i]]<Optim[j]+P[i])
            {
                Optim[j+W[i]]=Optim[j]+P[i];
                if(Optim[j+W[i]]>sol) sol=Optim[j+W[i]];
            }
        }
    }
    g<<sol<<'\n';
    return 0;
}