#include <fstream>
using namespace std;

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

int n, gmax, g[5005], v[5005], rez[5005];

int main()
{
    int i, j;

    fin>>n>>gmax;

    for (i=1; i<=n; i++)
    {
        fin>>g[i]>>v[i];
    }

    for (i=1; i<=n; i++)
    {
        for (j=gmax; j>=g[i]; j--)
        {
            if (v[i]+rez[j-g[i]]>rez[j])
            {
                rez[j]=v[i]+rez[j-g[i]];
            }
        }
    }

    fout<<rez[gmax];

    fin.close();
    fout.close();
    return 0;
}