#include <fstream>
using namespace std;

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

const int DIMN = 5001, DIMG = 10001;
int N, G;
int g[DIMN], v[DIMN];
int w[DIMG];

int main()
{
    fin >> N >> G;
    for ( int i = 1; i <= N; i++ )
        fin >> g[i] >> v[i];
    for ( int i = 1; i <= N; i++ )
        for ( int j = G - g[DIMN]; j >= 0; j-- )
            if ( w[j + g[i]] < w[j] + v[i] )
                w[j + g[i]] = w[j] + v[i];
    int m = 0;
    for ( int i = 1; i <= G; i++)
        m = max(m, w[i]);
    fout << m << '\n';
    fin.close();
    fout.close();
    return 0;
}