#include <fstream>
#include <cmath>

using namespace std;

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

int w[5010], p[5010], n, g, cw, i, d[5][10010], t, x;
int main()
{
    fin>>n>>g;
    for(i=1;i<=n;i++)
        fin>>w[i]>>p[i];

    t=1;
    for(i=1;i<=n;i++){
        for(cw=0;cw<=g;cw++){
            x=abs(t-1);
            d[t][cw]=d[x][cw];
            if(w[i]<=cw)
                d[t][cw]=max(d[x][cw], d[x][cw-w[i]]+p[i]);
        }
        t=abs(t-1);
    }
    t=abs(t-1);
    fout<<d[t][g];


    return 0;
}