#include <fstream>

using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
const int MAX_N=5001;
const int MAX_G=10000;
struct t_object
{
    int greutate;
    int profit;
};
int memo[MAX_N][MAX_G];
int dp_profit(int idx, int capacitate, t_object objs[])
{
    if(idx==0)
    {
        return 0;
    }
    if (capacitate==0)
    {
        return 0;
    }
    if(memo[idx][capacitate]!=0)
    {
        return memo[idx][capacitate];
    }
    if(objs[idx].greutate>capacitate)
    {
        memo[idx][capacitate]=dp_profit(idx-1, capacitate, objs);
        return memo[idx][capacitate];
    }
    int profit=dp_profit(idx-1, capacitate, objs);
    int new_capacitate=capacitate-objs[idx].greutate;
    int profit2=objs[idx].profit+dp_profit(idx-1, new_capacitate, objs);
    memo[idx][capacitate]=max(profit, profit2);
    return memo[idx][capacitate];
}
int main()
{
    int nr_elem;
    int max_gr;
    t_object objs[MAX_N];
    fin>>nr_elem;
    fin>>max_gr;
    for(int i=1; i<=nr_elem; i++)
    {
        int greutate;
        int profit;
        fin>>greutate;
        fin>>profit;
        t_object obj={greutate, profit};
        objs[i]=obj;
    }
    fout<<dp_profit(nr_elem, max_gr,objs);
    return 0;
}