#include <fstream>
#include <vector>
using namespace std;

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

int n, m, answ;
int g, p;

int main()
{
    is >> n >> m;
    vector<int> r(m + 1, -1);
    r[0] = 0;
    for ( int i = 1; i <= n; ++i )
    {
        is >> g >> p;
        for ( int j = answ; j >= 0; --j )
            if ( r[j] != -1 && j + g <= m && r[j] + p > r[j + g] )
            {
                r[j + g] = r[j] + p;
                answ = max(answ, r[j + g]);
            }
    }
    os << answ;
    is.close();
    os.close();
    return 0;
}