#include <fstream>
#define GMAX 10005

using namespace std;

ifstream f("rucsac.in");
ofstream g("rucsac.out");

int n, gm, gr, p;
int a[GMAX];

int main()
{
    f>>n>>gm;
    for(int i=1; i<=n; i++)
    {
        f>>gr>>p;
        for(int i=gm; i>=gr; i--)
        {
            a[i]=max(a[i], a[i-gr]+p);
        }
    }
    g<<a[gm];
    return 0;
}