#include <fstream>

using namespace std;
 ifstream f("rucsac.in");
 ofstream  cout("rucsac.out");
int g,n,v[10001],p,w,i,j,Max;
int main()
{
    f>>n>>g;
    for (i=1;i<=g;i++)
       v[i]=-1;
for (i=1;i<=n;i++){
   f>>w>>p;
  for (j=g-w;j>=0;j--)
       if(v[j]!=-1&&v[j+w]<v[j]+p)
              v[j+w]=v[j]+p;
}
Max=0;
for(i=1;i<=g;i++)
    if(v[i]>Max)
        Max=v[i];
cout<<Max;
return 0;
}