#include <fstream>
#define nmax 5001
#define gmax 10001
using namespace std;

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

int v[nmax], W[gmax], P[gmax];

int main()
{
    int N, G, sol = -1;
    fin >> N >> G;
    for (int i = 1; i <= N; i++)
        fin >> W[i] >> P[i];
    for (int i = 1; i <= N; i++)
        for (int j = G; j >= W[i]; j--)
        {
            v[j] = max(v[j], v[j - W[i]] + P[i]);
            sol = max(sol, v[j]);
        }
    fout << sol << '\n';

    fin.close();
    fout.close();
    return 0;
}