#include <fstream>
#define NMAX 5004
#define GMAX 10002

using namespace std;

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int n, G;
int g[NMAX], c[NMAX], cmax[GMAX];

void citire()
{
    int i;

    fin >> n >> G;
    for(i=1; i<=n; ++i)
        fin >> g[i] >> c[i];
}

void pd()
{
    int i, x;

    for(i=1; i<=n; ++i)
        for(x=G; x>=1; --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';
    return 0;
}