#include <iostream>
#include <fstream>

using namespace std;
int aux[10001],aux2[10001];
int main()
{
    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=1; j<=g; j++)
        {
            if(v[i]<=j)
                aux[j]=max(aux2[j-v[i]]+c[i],aux2[j]);
        }
        for(int j=0; j<=g; j++)
        {
            aux2[j]=aux[j];
            aux[j]=0;
        }
    }
    fout<<aux2[g];
    return 0;
}