#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n, i, j, gr;
int v[5002], g[5002], val[5002], maxim;
int main() {
    fin>>n>>gr;
    for (i=1;i<=gr;i++){
        v[i]=-1;
    }
    v[0]=0;
    for (i=1;i<=n;i++){
        fin>>g[i]>>val[i];
        for(j=gr; j>=0; j--){



            if(v[j]>=0 && j+g[i]<=gr){
                if(v[j+g[i]]<v[j]+val[i]){
                    v[j+g[i]]=v[j]+val[i];
                    if(v[j+g[i]]>maxim)
                        maxim=v[j+g[i]];
                }
            }
        }
    }
    fout<<maxim;
}