#include <fstream>
#define NM 5005
#define VAL 10005

using namespace std;

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

int N, G, i, j;
int w[NM], p[NM];
int dp[VAL], mx;

int main()
{
    fin >> N >> G;
    for (i=1; i<=N; i++)
    {
        fin >> w[i] >> p[i];
        for (j=G-w[i]; j>=0; j--)
        {
            if (j==0 || dp[j]!=0)
              dp[j+w[i]]=max(dp[j]+p[i], dp[j+w[i]]);
            mx=max(dp[j+w[i]], mx);
        }
    }
    fout << mx << '\n';
    fin.close();
    fout.close();
    return 0;
}