#include <fstream>

using namespace std;

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

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

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

    fout<<d[n][g];


    return 0;
}