#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
struct item
{
    int w;
    int p;
};
int n,g;
item listaItemi[5010];
int memo[5010][10010];
int calcRec(int pos,int greutate)
{
    if(memo[pos][greutate]!=0)
    {
        return memo[pos][greutate];
    }
    if(greutate==0 || pos == 0)
        return 0;
    else if(listaItemi[pos].w>greutate)
        return calcRec(pos-1,greutate);
    else
    {
        int temp1 = calcRec(pos-1,greutate);
        int temp2 = listaItemi[pos].p + calcRec(pos-1,greutate-listaItemi[pos].w);
        int res = (temp1>temp2)?temp1:temp2;
        memo[pos][greutate] = res;
        return res;
    }
}
int main()
{
    fin>>n>>g;
    for(int i = 1; i<=n; i++)
        fin>>listaItemi[i].w>>listaItemi[i].p;
    fout<<calcRec(n,g);
    return 0;
}