#include <fstream>
#define NMAX 5010
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n, w[NMAX],p[NMAX],pd[10010],G;
int main()
{
    f >> n >> G;
    for(int i  = 1; i <= n; ++i)
        f >> w[i] >> p[i];
    for(int i = 1; i <= n; ++i)
        for(int j = G; j >= w[i]; --j)
        pd[j] = max(pd[j], p[i] + pd[j - w[i]]);
    g << pd[G];
    f.close();
    g.close();
    return 0;
}