#include <fstream>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int ant[10001],cr[10001],w[5001],v[5001],*a,*b;

int main()
{
    int n,g;
    fin>>n>>g;
    for(int i=1;i<=n;i++)
    {
        fin>>w[i]>>v[i];
    }
    a=ant;
    b=cr;
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=g;j++)
        {
            if(w[i]<=j)
            {
                b[j]=max(a[j], v[i]+a[j-w[i]]);
            }
            else
            {
                b[j]=a[j];
            }
        }
        swap(a,b);
    }
    fout<<a[g];
    return 0;
}