#include <iostream>
#include <fstream>

using namespace std;

int n, g, prv[5001], crt[5001], p[5001], w[5001];

int main()
{
    ifstream fin ("rucsac.in");
    ofstream fout ("rucsac.out");
    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=0;j<=g;j++)
        {
            if (p[i]+prv[j-w[i]]>prv[j]&&j>=w[i])
                crt[j]=p[i]+prv[j-w[i]];
            else
                crt[j]=prv[j];
        }
        for (int j=1;j<=g;j++)
            prv[j]=crt[j];
    }
    fout<<crt[g];
    return 0;
}