#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];
int cmax[GMAX];
void citire();
void pd();
int main()
{
    citire();
    pd();
    fout<<cmax[G];
    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>0;x--)
        if(x>=g[i])
        if(cmax[x]<c[i]+cmax[x-g[i]])
        cmax[x]=c[i]+cmax[x-g[i]];

}