#include <iostream>
#include <fstream>

using namespace std;
int aux[10001];
int main()
{
    int sol=-1;
    ifstream fin ("rucsac.in");
    ofstream fout ("rucsac.out");
    int v[5001],c[5001];
    int g,n;
    fin>>n>>g;
    for(int i=1; i<=n; i++)
    {
        fin>>v[i]>>c[i];
        for(int j=g-v[i]; j>=0; j--)
        {
            if(aux[j+v[i]]<aux[j]+c[i])
                aux[j+v[i]]=aux[j]+c[i];
            if(sol<aux[j+v[i]])
                sol=aux[j+v[i]];

        }
    }
    fout<<sol;
    return 0;
}