#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n,i,j,gr,mx,x,y,b[10001];
int main()
{
    f >> n >> gr;
    f >> x >> y;
    b[x] = y;
    for(i = 2; i <= n; ++i)
    {
        f >> x >> y;
        for(j = gr - x; j >= 0; --j)
            if(b[j] > 0)
                if(b[j + x] == 0 || b[j + x] < b[j] + y)
                    b[j + x] = b[j] + y;
        if(b[x] == 0 || b[x] < y)
            b[x] = y;
    }
    mx = 0;
    for(i = 1; i <= gr; ++i)
        if(b[i] > mx)
            mx = b[i];
    g << mx << '\n';
    return 0;
}