#include <fstream>
using namespace std;
ifstream in ("rucsac.in");
ofstream out ("rucsac.out");

int n,g,Rez[5005],cost[5005],val[5005];

int main()
{
    int i,j,sol=0;
    in>>n>>g;
    for(i=1;i<=n;i++)
        in>>cost[i]>>val[i];
    for(i=1;i<=n;i++)
        for(j=g-cost[i];j>=0;j--)
            if(Rez[j+cost[i]]<Rez[j]+val[i])
        {
            Rez[j+cost[i]]=Rez[j]+val[i];
            if(Rez[j+cost[i]]>sol)
                sol=Rez[j+cost[i]];
        }
    out<<sol;
    return 0;
}