#include <fstream>

using namespace std;

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

int a[10001], w[5001], p[5001];

int main()
{
    int n, g, MAX = 0;
    in >> n >> g;
    for (int i = 1; i <= n; ++i)
        in >> w[i] >> p[i];
    for (int i = 1; i <= n; ++i)
    {
        for (int j = g - w[i]; j >= 0; --j)
        {
            a[j + w[i]] = max(a[j] + p[i], a[j + w[i]]);
            MAX = max(MAX, a[j + w[i]]);
        }
    }
    out << MAX;
    return 0;
}