#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");
int n, g,m, w[5001], p[5001], v[5001][10001];

int main()
{
    fin>>n>>g;
    for(int i=1;i<=n;i++)
    {
        fin>>w[i]>>p[i];
    }
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=g;j++)
            {
                if(j+w[i]<=g)
                    v[i][j]=max(v[i-1][j], v[i-1][j+w[i]]+p[i]);
                m=max(m, v[i][j]);
            }

    }
   /* for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=n;j++)
            cout<<setw(4)<<v[i][j]<<" ";
        cout<<endl;
    }*/
    fout<<m;
    return 0;
}