#include <iostream>
#include <fstream>
using namespace std;
ifstream f("rucsac.in");
ofstream g("rucsac.out");
int n,g1,gr,i,j,greu[10001],p[10001],mx,pu;
int main()
{
    f >> n >> g1;
    for (i = 1; i <= n; i ++)
    {
        f >> gr >> pu;
        for (j = g1 - gr; j >= 0; j --)
        {
            if(greu[j] == 1)
            {
                greu[j + gr]=1;
                p[j + gr] = max(p[j + gr], p[j] + pu);
                mx = max(mx, p[j + gr]);
            }
        }
    }
    g << mx;
    return 0;

}