#include<fstream>
#include<algorithm>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int w[5010],p[5010];
int n,G,i,cw,d[2][10010],l,pmax;
int main()
{
    f>>n>>G;
    for(i=1;i<=n;i++)
    f>>w[i]>>p[i];
    l=0;
    for(i=1;i<=n;i++,l=1-l)
    for(cw=0;cw<=G;cw++)
    {
        d[1-l][cw]=d[l][cw];
        if(w[i]<=cw)
        d[1-l][cw]=max(d[1-l][cw],d[l][cw-w[i]]+p[i]);
    }
    pmax=d[l][G];
    g<<pmax<<"\n";
    return 0;
}