#include <iostream>
#include<fstream>
#define GMAX 10002
#define NMAX 5004
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsa.out");
int n,G;
int g[NMAX];
int c[NMAX];
int cmax[GMAX];
void citire()
{
    int i;
    fin>>n>>G;
    for(i =1; i<=n;i++)
    {
        fin>>g[i]>>c[i];
    }
}
void pd()
{
    for(int i =1;i<=n;i++)
    {
        for(int x=G;x<0;x--)
        {
            if(x>=g[i])
            {
                if(cmax[x]<c[i]+cmax[x-g[i]])
                {
                    cmax[x]=c[i]+cmax[x-g[i]];
                }
            }
        }
    }
}
int main()
{
    citire();
    pd();
    fout<<cmax[G]<<'\n';
    fout.close();
    return 0;
}