#include <fstream>
using namespace std;
int el[5000], val[5000], optim[10001];
int main()
{
    ifstream f("rucsac.in");
    ofstream g("rucsac.out");
    int n, G, i, j;
    f >> n >> G;
    for (i=0;i<n;i++)
        f >> el[i]>> val[i];
    for (i=0;i<n;i++)
        for (j=G-el[i];j>=0;j--)
            if (optim[j+el[i]] < optim[j]+val[i])
                optim[j+el[i]] = optim[j]+val[i];
    g << optim[G];
    f.close(), g.close();
    return 0;
}