#include <fstream>

using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
const int max_n=5005;
const int max_g=10005;
struct t_object {
    int weight;
    int profit;
};
int dp_profit(int idx,int capacitate, t_object objs[])
{
    if(idx==0)
        return 0;
    if(capacitate==0)
        return 0;
    t_object curr_obj=objs[idx];
    if(curr_obj.weight > capacitate)
        return dp_profit(idx-1,capacitate,objs);
    // cazul 1 nu punem obiectul
    int profit1=dp_profit(idx-1,capacitate,objs);
    //cazul2 punem obiectul
    int profit2= objs[idx].profit+dp_profit(idx-1,capacitate-curr_obj.weight,objs);
    return max(profit1,profit2);
}
int main()
{
    int n,greutate;
    fin>>n>>greutate;
    t_object objs[max_n];
    for(int i=1;i<=n;i++)
    {
        int curr_greutate;
        int curr_profit;
        fin>>curr_greutate;
        fin>>curr_profit;
        t_object obiect={curr_greutate,curr_profit};
        objs[i]=obiect;
    }
    fout<<dp_profit(n,greutate,objs);
    return 0;
}