#include <iostream>
#include <fstream>
using namespace std;
/*
ifstream fin("spectacole.in");
ofstream fout("spectacole.out");
*/
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int main()
{
    /*
    int n,i,j,ora,minut,s[101],f[101],poz[101],aux;
    fin >> n;
    for (i=1;i<=n;++i)
    {
        poz[i]=i;
        fin >> ora >> minut;
        s[i]=ora*60+minut;
        fin >> ora >> minut;
        f[i]=ora*60+minut;
    }
    for (i=1;i<=n;++i)
    {
        for (j=i+1;j<=n;++j)
        {
            if (f[poz[i]]>f[poz[j]])
            {
                aux=poz[i];
                poz[i]=poz[j];
                poz[j]=aux;
            }
        }
    }
    fout << poz[1] << " ";
    j=1;
    for (i=2;i<=n;++i)
    {
        if (s[poz[i]]>=f[poz[j]])
        {
            fout << poz[i] << " ";
            j=i;
        }
    }
    */
    int N,G,i,j;
    fin >> N >> G;
    int W[5001],P[5001],sol=0,a[10001]={0};
    for (i=1;i<=N;++i)
    {
        fin >> W[i] >> P[i];
    }
    for (i=1;i<=N;++i)
    {
        for (j=G-W[i];j>=0;--j)
        {
            if (a[j+W[i]]<a[j]+P[i])
            {
                a[j+W[i]]=a[j]+P[i];
                if (a[j+W[i]]>sol)
                {
                    sol=a[j+W[i]];
                }
            }
        }
    }
    fout << sol;
    return 0;
}