#include <fstream>
#define g first
#define p second
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n,i,j,G,sc,maxim;
int D[10002];
pair <int,int> v[5002];
int main(){
    fin>>n>>G;
    for(i=1;i<=n;i++)
        fin>>v[i].g>>v[i].p;
    D[0]=0;
    for(i=1;i<=G;i++)
        D[i]=-1;
    for(i=1;i<=n;i++){
        for(j=G;j>=0;j--){
            sc=j+v[i].g;
            if(D[j]!=-1 && sc<=G){
                D[sc]=max(D[sc],D[j]+v[i].p);
            }
        }
    }
    for(i=0;i<=G;i++)
        maxim=max(maxim,D[i]);
    fout<<maxim;
    return 0;
}