#include <fstream>
#define NMAX 5002
#define GMAX 10002
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,G,lc=1,lp=0;
int g[NMAX],c[NMAX];
int cmax[2][GMAX];
void citire();
void pd();
int main()
{
    citire();
    pd();
    fout<<cmax[lp][G]<<'\n';
    fout.close();
    return 0;
}

void citire()
{
    int i;
    fin>>n>>G;
    for(i=1;i<=n;i++)
        fin>>g[i]>>c[i];
}
void pd()
{
    int x;
    int lc=1,lp=0,i;
    for(i=1;i<=n;i++)
    {
        for(x=1;x<=G;x++)
        {
            cmax[lc][x]=cmax[lp][x];
            if(g[i]<=x&&cmax[lp][x-g[i]]+c[i]>cmax[lc][x])
            {
                cmax[lc][x]=cmax[lp][x-g[i]]+c[i];
            }
        }
        lp=1-lp;
        lc=1-lc;
    }
}