#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 - w[i]; j >= 0; --j)
            pd[j + w[i]] = max(pd[j + w[i]], p[i] + pd[j]);
    g << pd[G];
    return 0;
}