#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
const int Nmax=5000+5,Gmax=10000+5;
int N,G;
int W[Nmax],P[Nmax],Optim[Gmax];
int main()
{
    int sol=0;
    fin>>N>>G;
    for(int i=1;i<=N;++i)fin>>W[i]>>P[i];
    Optim[0]=0;
    for(int i=1;i<=N;++i)
    {
        for(int 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]];
            }
        }
    }
    fout<<sol;
    return 0;
}