#include <fstream>
#define GMAX 10010
#define NMAX 5004

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

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

void citire();
void pd();

int main()
{
    citire();
    pd();
    fout<<cmax[G]<<'\n';
    return 0;
}
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]];
}