#include <fstream>
 
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int w[5001], d[10001], p[10001];
int main () {
int n, g;
fin>>n>>g;
 
 for (int i=1; i<=n; i++) {
        fin>>w[i]>>p[i];
}
  d[0]=1;
for (int i=1; i<=n; i++) {
for (int j=g; j>=w[i]; j--) {
if (d[j-w[i]]!=0 && p[i]+d[j-w[i]]>=d[j]) {
 d[j]=p[i]+d[j-w[i]];      }
     }
}
  int sol=0;
  for (int i=0; i<=g; i++) {
if (d[i]>sol) {
sol=d[i];
 }
}
fout<<sol-1<<"\n";
 return 0;
}