#include <fstream>
using namespace std;

ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int v[1000],v2[1000];

int main()
{
    int n,g,w,p,i,j;
    fin>>n>>g;
    while(n)
    {
        fin>>w>>p;
        for(i=w;i<=g;i++)
        {
            if(v2[i-w]!=n && v[i-w]+p>v[i])
            {
                v2[i]=n;
                v[i]=v[i-w]+p;
            }
            else
            {
                if(v[i]<v[i-1])
                {
                    v2[i]=v2[i-1];
                    v[i]=v[i-1];
                }
            }
        }
       // for(j=1;j<=g;j++)
        //cout<<v[j]<<" ";
        //cout<<"\n";
        n--;
    }
    fout<<v[g];
}