#include <fstream>
using namespace std;

ifstream cin("rucsac.in");
ofstream cout("rucsac.out");

long long nr, maxim, greutate, valoare, capat;
long long v[100004], final;

int main()
{
    cin >> nr >> maxim;
    v[0] = 1;
    for(int i=1; i <= nr; i++)
    {
        cin >> greutate >> valoare;
        capat = maxim-greutate;
        for(int j=capat; j >= 0; j--)
        {
            if(v[j] != 0)
            {
                v[j+greutate] = max(v[j+greutate],v[j]+valoare);
            }
        }
    }
    for(int i=1; i <= maxim; i++)
    final = max(final, v[i]);
    cout << final-1;
}