#include <fstream>
#define NMAX 5009
#define GMAX 10009
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
long long n, pd[GMAX], p[NMAX], w[NMAX], Wmax;
int main()
{
    f >> n >> Wmax;
    for(int i = 1; i <= n; ++i)
        f >> w[i] >> p[i];
    for(int i = 1; i <= n; ++i)
        for(int j = Wmax - w[i]; j >= 0; --j)
            pd[j + w[i]] = max(pd[j + w[i]], pd[j] + p[i]);
    g << pd[Wmax];
    f.close();
    g.close();
    return 0;
}