#include <iostream>
#include <fstream>

using namespace std;

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

int n, g, d[10002], w, p;

int main()
{
    fin >> n >> g;
    for (int i = 1; i <= n; i++)
    {
        fin >> w >> p;
        for (int j = g; j >= w; j--)
            d[j] = max(d[j], d[j - w] + p);
    }
    fout << d[g];
    return 0;
}