#include <fstream>
using namespace std;
ifstream in("rucsac.in");
ofstream out("rucsac.out");
int n, g, pd[10005];

int main()
{
    in >> n >> g;
    for(int p, w, i = 1; i <= n; ++i)
    {
        in >> w >> p;
        for(int j = g-w; j >= 0; --j)
        {
            if(pd[j+w] < pd[j] + p)
                pd[j+w] = pd[j] + p;
        }
    }
    out << pd[g] << '\n';
    in.close(), out.close();
    return 0;
}