#include <fstream>
#define NMax 5005
#define GMax 10005
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int N,G,W[NMax],P[NMax],DP[NMax][GMax];
void Read()
{
    fin>>N>>G;
    for(int i=1;i<=N;i++)
        {
            fin>>W[i]>>P[i];
        }
}
void Solve()
{
    for(int i=1;i<=N;i++)
        for(int j=1;j<=G;j++)
            {
                DP[i][j]=DP[i-1][j];
                if(j>=W[i])
                    DP[i][j]=max(DP[i][j],DP[i-1][j-W[i]]+P[i]);
            }
}
void Print()
{
    fout<<DP[N][G]<<'\n';
}
int main()
{
    Read();
    Solve();
    Print();
    return 0;
}