#include <fstream>

using namespace std;

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

int d[10005];

int main()
{
    int n, G, g, v;
    fin >> n >> G;
    for(int i = 1; i <= G; i++)
        d[i] = -1;
    for(int i = 1; i <= n; i++)
    {
        fin >> g >> v;
        for(int i = G - g; i >= 0; i--)
        {
            if(d[i] != -1 && d[i] + v > d[i + g])
                d[i + g] = d[i] + v;
        }
    }
    int mx = 0;
    for(int i = 0; i <= G; i++)
        if(d[i] > mx)
            mx = d[i];
    fout << mx;
    return 0;
}